A water deficit during pod development in lentils reduces flower and pod numbers but not seed size

R. Shrestha, Neil Turner, Kadambot Siddique, David Turner, J. Speijers

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Abstract

An experiment was conducted under controlled conditions in a glasshouse to determine the sensitivity of reproductive development of lentil (Lens culinaris Medikus) genotypes of different origins to water deficit. The 3 genotypes were Cassab (West Asia), Simal (South Asia), and ILL 7979 a crossbred between a West Asian genotype and a South Asian genotype. Two watering treatments, a well-watered control and a water-deficit treatment, were imposed from the beginning of podding. Leaf water relations, total dry matter production, leaf area, and number of flowers, pods, and seeds were measured from podding to maturity.In the well-watered plants the leaf water potential (psi(leaf)) before sunrise ranged from -0.6 to -0.8 MPa. When subjected to water deficit, psi(leaf) fell to about -3.0 MPa. Genotypes did not show variation in vegetative growth or seed yield under either well-watered or water-deficit conditions, but they differed significantly in the number of flowers, fruiting nodes, pods, and seeds, and harvest index (HI). Seed size in Cassab was 61% larger than ILL 7979 and 105% larger than Simal. The small-seeded genotypes produced the highest number of fruiting nodes and hence a greater number of flowers, pods, and seeds. Seed size was positively correlated with seed growth rate ( r = 0.77**) and seed fill duration (r = 0.45*).The water deficit reduced plant height by about 20%, leaf area by 48-81%, and total dry matter by about 60% compared with well-watered plants. The water deficit reduced flower number by 35-46% and increased seed abortion (empty pods) by 17-46%. The water deficit had no effect on the maximum seed growth rate, seed fill duration, or final seed size in any of the 3 genotypes. Therefore, the 70% reduction in seed yield induced by the water deficit was primarily due to a reduction in pod and seed numbers (by 59-70%) rather than individual seed growth rate and seed size.
Original languageEnglish
Pages (from-to)427-438
JournalAustralian Journal of Agricultural Research
Volume57
Issue number4
DOIs
Publication statusPublished - 2006

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lentils
pods
flowers
seeds
water
genotype
seed yield
fruiting
leaf area
seed abortion
West Asia
leaves
duration
Lens culinaris
South Asia
harvest index
leaf water potential
dry matter accumulation
vegetative growth
crossbreds

Cite this

@article{3ae7259869d349f29120ada0345b88a4,
title = "A water deficit during pod development in lentils reduces flower and pod numbers but not seed size",
abstract = "An experiment was conducted under controlled conditions in a glasshouse to determine the sensitivity of reproductive development of lentil (Lens culinaris Medikus) genotypes of different origins to water deficit. The 3 genotypes were Cassab (West Asia), Simal (South Asia), and ILL 7979 a crossbred between a West Asian genotype and a South Asian genotype. Two watering treatments, a well-watered control and a water-deficit treatment, were imposed from the beginning of podding. Leaf water relations, total dry matter production, leaf area, and number of flowers, pods, and seeds were measured from podding to maturity.In the well-watered plants the leaf water potential (psi(leaf)) before sunrise ranged from -0.6 to -0.8 MPa. When subjected to water deficit, psi(leaf) fell to about -3.0 MPa. Genotypes did not show variation in vegetative growth or seed yield under either well-watered or water-deficit conditions, but they differed significantly in the number of flowers, fruiting nodes, pods, and seeds, and harvest index (HI). Seed size in Cassab was 61{\%} larger than ILL 7979 and 105{\%} larger than Simal. The small-seeded genotypes produced the highest number of fruiting nodes and hence a greater number of flowers, pods, and seeds. Seed size was positively correlated with seed growth rate ( r = 0.77**) and seed fill duration (r = 0.45*).The water deficit reduced plant height by about 20{\%}, leaf area by 48-81{\%}, and total dry matter by about 60{\%} compared with well-watered plants. The water deficit reduced flower number by 35-46{\%} and increased seed abortion (empty pods) by 17-46{\%}. The water deficit had no effect on the maximum seed growth rate, seed fill duration, or final seed size in any of the 3 genotypes. Therefore, the 70{\%} reduction in seed yield induced by the water deficit was primarily due to a reduction in pod and seed numbers (by 59-70{\%}) rather than individual seed growth rate and seed size.",
author = "R. Shrestha and Neil Turner and Kadambot Siddique and David Turner and J. Speijers",
year = "2006",
doi = "10.1071/AR05225",
language = "English",
volume = "57",
pages = "427--438",
journal = "Crop & Pasture Science",
issn = "1836-0947",
publisher = "CSIRO Publishing",
number = "4",

}

TY - JOUR

T1 - A water deficit during pod development in lentils reduces flower and pod numbers but not seed size

AU - Shrestha, R.

AU - Turner, Neil

AU - Siddique, Kadambot

AU - Turner, David

AU - Speijers, J.

PY - 2006

Y1 - 2006

N2 - An experiment was conducted under controlled conditions in a glasshouse to determine the sensitivity of reproductive development of lentil (Lens culinaris Medikus) genotypes of different origins to water deficit. The 3 genotypes were Cassab (West Asia), Simal (South Asia), and ILL 7979 a crossbred between a West Asian genotype and a South Asian genotype. Two watering treatments, a well-watered control and a water-deficit treatment, were imposed from the beginning of podding. Leaf water relations, total dry matter production, leaf area, and number of flowers, pods, and seeds were measured from podding to maturity.In the well-watered plants the leaf water potential (psi(leaf)) before sunrise ranged from -0.6 to -0.8 MPa. When subjected to water deficit, psi(leaf) fell to about -3.0 MPa. Genotypes did not show variation in vegetative growth or seed yield under either well-watered or water-deficit conditions, but they differed significantly in the number of flowers, fruiting nodes, pods, and seeds, and harvest index (HI). Seed size in Cassab was 61% larger than ILL 7979 and 105% larger than Simal. The small-seeded genotypes produced the highest number of fruiting nodes and hence a greater number of flowers, pods, and seeds. Seed size was positively correlated with seed growth rate ( r = 0.77**) and seed fill duration (r = 0.45*).The water deficit reduced plant height by about 20%, leaf area by 48-81%, and total dry matter by about 60% compared with well-watered plants. The water deficit reduced flower number by 35-46% and increased seed abortion (empty pods) by 17-46%. The water deficit had no effect on the maximum seed growth rate, seed fill duration, or final seed size in any of the 3 genotypes. Therefore, the 70% reduction in seed yield induced by the water deficit was primarily due to a reduction in pod and seed numbers (by 59-70%) rather than individual seed growth rate and seed size.

AB - An experiment was conducted under controlled conditions in a glasshouse to determine the sensitivity of reproductive development of lentil (Lens culinaris Medikus) genotypes of different origins to water deficit. The 3 genotypes were Cassab (West Asia), Simal (South Asia), and ILL 7979 a crossbred between a West Asian genotype and a South Asian genotype. Two watering treatments, a well-watered control and a water-deficit treatment, were imposed from the beginning of podding. Leaf water relations, total dry matter production, leaf area, and number of flowers, pods, and seeds were measured from podding to maturity.In the well-watered plants the leaf water potential (psi(leaf)) before sunrise ranged from -0.6 to -0.8 MPa. When subjected to water deficit, psi(leaf) fell to about -3.0 MPa. Genotypes did not show variation in vegetative growth or seed yield under either well-watered or water-deficit conditions, but they differed significantly in the number of flowers, fruiting nodes, pods, and seeds, and harvest index (HI). Seed size in Cassab was 61% larger than ILL 7979 and 105% larger than Simal. The small-seeded genotypes produced the highest number of fruiting nodes and hence a greater number of flowers, pods, and seeds. Seed size was positively correlated with seed growth rate ( r = 0.77**) and seed fill duration (r = 0.45*).The water deficit reduced plant height by about 20%, leaf area by 48-81%, and total dry matter by about 60% compared with well-watered plants. The water deficit reduced flower number by 35-46% and increased seed abortion (empty pods) by 17-46%. The water deficit had no effect on the maximum seed growth rate, seed fill duration, or final seed size in any of the 3 genotypes. Therefore, the 70% reduction in seed yield induced by the water deficit was primarily due to a reduction in pod and seed numbers (by 59-70%) rather than individual seed growth rate and seed size.

U2 - 10.1071/AR05225

DO - 10.1071/AR05225

M3 - Article

VL - 57

SP - 427

EP - 438

JO - Crop & Pasture Science

JF - Crop & Pasture Science

SN - 1836-0947

IS - 4

ER -