Physiological and seed yield responses to water deficits among lentil genotypes from diverse origins

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Abstract

The effect of water deficits at 2 growth stages on the physiology and growth of lentil ( Lens culinaris Medikus subsp. culinaris) genotypes bred/selected for 3 regions was examined in a glasshouse experiment. The water regimes imposed were: ( i) a well-watered control, ( ii) water withheld at flowering, from 72 to 93 days after sowing ( DAS), and ( iii) water withheld from podding ( 93 DAS) to maturity. The genotypes were a West Asian genotype released in Australia ( Cassab), 2 South Asian Nepali cultivars ( Khajura 2 and Simal), and 3 crossbreds between West Asian and South Asian parents ( ILL 6829, ILL 7979, and ILL 7982). ILL 7979 and Simal had significantly greater total dry matter, water use, seed yield, number of pods and seeds per plant, and harvest index ( HI) than the other genotypes under well-watered conditions. Water deficits reduced seed yield by up to 60% in the crossbreds and the South Asian cultivar, Simal. However, seed yield was increased by the water deficit at flowering and the water deficit at podding in the West Asian genotype, Cassab, and the South Asian genotype, Khajura 2, respectively. In the other genotypes, withholding water at flowering or podding reduced leaf area ( 48 - 55%), total dry matter ( 32 - 50%),. ower production ( 22 - 55%), and number of pods and seeds ( 27 - 66%), with significantly higher. ower drop and empty pods when water was withheld. The higher seed yield in Cassab and Khajura 2 when water was withheld was related to the production of more flowers and the maintenance of pod and seed set when they were re-watered after the period of water deficit.When water was withheld during flowering, the West Asian genotype Cassab and the crossbred ILL 6829 used less water and hence maintained a high leaf water potential (psi(leaf)), whereas psi(leaf) decreased earlier to lower values in the crossbred ILL 7979 and the South Asian genotypes Khajura 2 and Simal. There were no significant differences in leaf net photosynthesis ( P-N), or stomatal conductance ( g(S)), among genotypes during flowering and early podding, but PN and gS were reduced by 22 - 38 and 19 - 67%, respectively, when water was withheld. The lower psi(leaf) in ILL 7979, Simal, and Khajura 2 induced greater osmotic adjustment ( OA) during the drying cycle at flowering, whereas there was no or little OA when water was withheld at podding. Variation in physiological traits ( PN, gS, OA) under both watering regimes was not directly related to seed yield, but seed number was related to seed yield under both well-watered and water-deficit conditions.
Original languageEnglish
Pages (from-to)903-915
JournalAustralian Journal of Agricultural Research
Volume57
Issue number8
DOIs
Publication statusPublished - 2006

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lentils
seed yield
genotype
water
flowering
pods
crossbreds
leaves
sowing
seeds
Lens culinaris subsp. culinaris
cultivars
harvest index
seed set
leaf water potential

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@article{096b433420614f0e8ed53f571a98eb10,
title = "Physiological and seed yield responses to water deficits among lentil genotypes from diverse origins",
abstract = "The effect of water deficits at 2 growth stages on the physiology and growth of lentil ( Lens culinaris Medikus subsp. culinaris) genotypes bred/selected for 3 regions was examined in a glasshouse experiment. The water regimes imposed were: ( i) a well-watered control, ( ii) water withheld at flowering, from 72 to 93 days after sowing ( DAS), and ( iii) water withheld from podding ( 93 DAS) to maturity. The genotypes were a West Asian genotype released in Australia ( Cassab), 2 South Asian Nepali cultivars ( Khajura 2 and Simal), and 3 crossbreds between West Asian and South Asian parents ( ILL 6829, ILL 7979, and ILL 7982). ILL 7979 and Simal had significantly greater total dry matter, water use, seed yield, number of pods and seeds per plant, and harvest index ( HI) than the other genotypes under well-watered conditions. Water deficits reduced seed yield by up to 60{\%} in the crossbreds and the South Asian cultivar, Simal. However, seed yield was increased by the water deficit at flowering and the water deficit at podding in the West Asian genotype, Cassab, and the South Asian genotype, Khajura 2, respectively. In the other genotypes, withholding water at flowering or podding reduced leaf area ( 48 - 55{\%}), total dry matter ( 32 - 50{\%}),. ower production ( 22 - 55{\%}), and number of pods and seeds ( 27 - 66{\%}), with significantly higher. ower drop and empty pods when water was withheld. The higher seed yield in Cassab and Khajura 2 when water was withheld was related to the production of more flowers and the maintenance of pod and seed set when they were re-watered after the period of water deficit.When water was withheld during flowering, the West Asian genotype Cassab and the crossbred ILL 6829 used less water and hence maintained a high leaf water potential (psi(leaf)), whereas psi(leaf) decreased earlier to lower values in the crossbred ILL 7979 and the South Asian genotypes Khajura 2 and Simal. There were no significant differences in leaf net photosynthesis ( P-N), or stomatal conductance ( g(S)), among genotypes during flowering and early podding, but PN and gS were reduced by 22 - 38 and 19 - 67{\%}, respectively, when water was withheld. The lower psi(leaf) in ILL 7979, Simal, and Khajura 2 induced greater osmotic adjustment ( OA) during the drying cycle at flowering, whereas there was no or little OA when water was withheld at podding. Variation in physiological traits ( PN, gS, OA) under both watering regimes was not directly related to seed yield, but seed number was related to seed yield under both well-watered and water-deficit conditions.",
author = "R. Shrestha and Neil Turner and Kadambot Siddique and David Turner",
year = "2006",
doi = "10.1071/AR05204",
language = "English",
volume = "57",
pages = "903--915",
journal = "Crop & Pasture Science",
issn = "1836-0947",
publisher = "CSIRO Publishing",
number = "8",

}

TY - JOUR

T1 - Physiological and seed yield responses to water deficits among lentil genotypes from diverse origins

AU - Shrestha, R.

AU - Turner, Neil

AU - Siddique, Kadambot

AU - Turner, David

PY - 2006

Y1 - 2006

N2 - The effect of water deficits at 2 growth stages on the physiology and growth of lentil ( Lens culinaris Medikus subsp. culinaris) genotypes bred/selected for 3 regions was examined in a glasshouse experiment. The water regimes imposed were: ( i) a well-watered control, ( ii) water withheld at flowering, from 72 to 93 days after sowing ( DAS), and ( iii) water withheld from podding ( 93 DAS) to maturity. The genotypes were a West Asian genotype released in Australia ( Cassab), 2 South Asian Nepali cultivars ( Khajura 2 and Simal), and 3 crossbreds between West Asian and South Asian parents ( ILL 6829, ILL 7979, and ILL 7982). ILL 7979 and Simal had significantly greater total dry matter, water use, seed yield, number of pods and seeds per plant, and harvest index ( HI) than the other genotypes under well-watered conditions. Water deficits reduced seed yield by up to 60% in the crossbreds and the South Asian cultivar, Simal. However, seed yield was increased by the water deficit at flowering and the water deficit at podding in the West Asian genotype, Cassab, and the South Asian genotype, Khajura 2, respectively. In the other genotypes, withholding water at flowering or podding reduced leaf area ( 48 - 55%), total dry matter ( 32 - 50%),. ower production ( 22 - 55%), and number of pods and seeds ( 27 - 66%), with significantly higher. ower drop and empty pods when water was withheld. The higher seed yield in Cassab and Khajura 2 when water was withheld was related to the production of more flowers and the maintenance of pod and seed set when they were re-watered after the period of water deficit.When water was withheld during flowering, the West Asian genotype Cassab and the crossbred ILL 6829 used less water and hence maintained a high leaf water potential (psi(leaf)), whereas psi(leaf) decreased earlier to lower values in the crossbred ILL 7979 and the South Asian genotypes Khajura 2 and Simal. There were no significant differences in leaf net photosynthesis ( P-N), or stomatal conductance ( g(S)), among genotypes during flowering and early podding, but PN and gS were reduced by 22 - 38 and 19 - 67%, respectively, when water was withheld. The lower psi(leaf) in ILL 7979, Simal, and Khajura 2 induced greater osmotic adjustment ( OA) during the drying cycle at flowering, whereas there was no or little OA when water was withheld at podding. Variation in physiological traits ( PN, gS, OA) under both watering regimes was not directly related to seed yield, but seed number was related to seed yield under both well-watered and water-deficit conditions.

AB - The effect of water deficits at 2 growth stages on the physiology and growth of lentil ( Lens culinaris Medikus subsp. culinaris) genotypes bred/selected for 3 regions was examined in a glasshouse experiment. The water regimes imposed were: ( i) a well-watered control, ( ii) water withheld at flowering, from 72 to 93 days after sowing ( DAS), and ( iii) water withheld from podding ( 93 DAS) to maturity. The genotypes were a West Asian genotype released in Australia ( Cassab), 2 South Asian Nepali cultivars ( Khajura 2 and Simal), and 3 crossbreds between West Asian and South Asian parents ( ILL 6829, ILL 7979, and ILL 7982). ILL 7979 and Simal had significantly greater total dry matter, water use, seed yield, number of pods and seeds per plant, and harvest index ( HI) than the other genotypes under well-watered conditions. Water deficits reduced seed yield by up to 60% in the crossbreds and the South Asian cultivar, Simal. However, seed yield was increased by the water deficit at flowering and the water deficit at podding in the West Asian genotype, Cassab, and the South Asian genotype, Khajura 2, respectively. In the other genotypes, withholding water at flowering or podding reduced leaf area ( 48 - 55%), total dry matter ( 32 - 50%),. ower production ( 22 - 55%), and number of pods and seeds ( 27 - 66%), with significantly higher. ower drop and empty pods when water was withheld. The higher seed yield in Cassab and Khajura 2 when water was withheld was related to the production of more flowers and the maintenance of pod and seed set when they were re-watered after the period of water deficit.When water was withheld during flowering, the West Asian genotype Cassab and the crossbred ILL 6829 used less water and hence maintained a high leaf water potential (psi(leaf)), whereas psi(leaf) decreased earlier to lower values in the crossbred ILL 7979 and the South Asian genotypes Khajura 2 and Simal. There were no significant differences in leaf net photosynthesis ( P-N), or stomatal conductance ( g(S)), among genotypes during flowering and early podding, but PN and gS were reduced by 22 - 38 and 19 - 67%, respectively, when water was withheld. The lower psi(leaf) in ILL 7979, Simal, and Khajura 2 induced greater osmotic adjustment ( OA) during the drying cycle at flowering, whereas there was no or little OA when water was withheld at podding. Variation in physiological traits ( PN, gS, OA) under both watering regimes was not directly related to seed yield, but seed number was related to seed yield under both well-watered and water-deficit conditions.

U2 - 10.1071/AR05204

DO - 10.1071/AR05204

M3 - Article

VL - 57

SP - 903

EP - 915

JO - Crop & Pasture Science

JF - Crop & Pasture Science

SN - 1836-0947

IS - 8

ER -