Ear:stem ratios in breeding populations of wheat: Significance for yield improvement.

KHM SIDDIQUE, BR WHAN

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Earlier studies showed that the ratio of the weight of the wheat ear to stem at anthesis (ear:stem ratio) may give a better indication of potential yield than harvest index because it is determined early in the life cycle and is not affected by post anthesis stress. These studies concluded that selection for high ear:stem ratio at anthesis may lead to further improvement in grain yield of wheat. The present work was undertaken in the field to identify lines varying in ear:stem ratio in breeding populations and to study its implications for yield improvement.

At anthesis stem length, ear length, tiller number, dry weight of stem and ear and ear:stem ratio were measured in 14 crosses on F-2 Single plants and F-2 derived lines grown in the F-3, F-4, and F-5 at three locations in Western Australia over four seasons. In addition, biomass, grain yield and yield components were measured on selected crosses at two locations on F-2 derived lines grown in the F-4 and F-5 There was a considerable range of ear:stem ratio between and within the crosses studied. Although ear:stem ratio was strongly correlated with stem length, there was substantial variation within stem length classes. Ear:stem ratio had a high mean broad sense heritability (82%), whereas HI grain yield and above ground biomass had lower heritabilities, 68, 55 and 35% respectively. Ear:stem ratio was strongly correlated between generations and sites indicating stability of this character. Ear:stem ratio had a significant positive correlation with grain yield, HI, grains per ear and per m(2). The correlation of grain yield with HI was equal or slightly higher than that of grain yield with ear:stem ratio.

Ear:stem ratio offers promise as a predictor of HI and yield potential where post-anthesis moisture stress can influence HI. Ear:stem ratio measurement is unlikely to be adopted for selection purposes in routine breeding programs, as it is laborious and time consuming. However, ear:stem ratio could be used to identify superior parental genotypes and early generation selections from special crosses in terms of its ability to partition assimilate.

Original languageEnglish
Pages (from-to)241-254
Number of pages14
JournalEuphytica
Volume73
Issue number3
DOIs
Publication statusPublished - 1994

Cite this

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title = "Ear:stem ratios in breeding populations of wheat: Significance for yield improvement.",
abstract = "Earlier studies showed that the ratio of the weight of the wheat ear to stem at anthesis (ear:stem ratio) may give a better indication of potential yield than harvest index because it is determined early in the life cycle and is not affected by post anthesis stress. These studies concluded that selection for high ear:stem ratio at anthesis may lead to further improvement in grain yield of wheat. The present work was undertaken in the field to identify lines varying in ear:stem ratio in breeding populations and to study its implications for yield improvement.At anthesis stem length, ear length, tiller number, dry weight of stem and ear and ear:stem ratio were measured in 14 crosses on F-2 Single plants and F-2 derived lines grown in the F-3, F-4, and F-5 at three locations in Western Australia over four seasons. In addition, biomass, grain yield and yield components were measured on selected crosses at two locations on F-2 derived lines grown in the F-4 and F-5 There was a considerable range of ear:stem ratio between and within the crosses studied. Although ear:stem ratio was strongly correlated with stem length, there was substantial variation within stem length classes. Ear:stem ratio had a high mean broad sense heritability (82{\%}), whereas HI grain yield and above ground biomass had lower heritabilities, 68, 55 and 35{\%} respectively. Ear:stem ratio was strongly correlated between generations and sites indicating stability of this character. Ear:stem ratio had a significant positive correlation with grain yield, HI, grains per ear and per m(2). The correlation of grain yield with HI was equal or slightly higher than that of grain yield with ear:stem ratio.Ear:stem ratio offers promise as a predictor of HI and yield potential where post-anthesis moisture stress can influence HI. Ear:stem ratio measurement is unlikely to be adopted for selection purposes in routine breeding programs, as it is laborious and time consuming. However, ear:stem ratio could be used to identify superior parental genotypes and early generation selections from special crosses in terms of its ability to partition assimilate.",
keywords = "BREEDING POPULATIONS, EAR-STEM RATIO, GRAIN YIELD, HARVEST INDEX, HERITABILITY, TRITICUM AESTIVUM, WHEAT, INCREASING EARLY VIGOR, GRAIN-YIELD, SPRING WHEAT, GENETIC IMPROVEMENTS, TOTAL BIOMASS, SELECTION, LINES, OLD, ENVIRONMENT",
author = "KHM SIDDIQUE and BR WHAN",
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doi = "10.1007/BF00036703",
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pages = "241--254",
journal = "Euphytica: international journal on plant breeding",
issn = "0014-2336",
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Ear:stem ratios in breeding populations of wheat: Significance for yield improvement. / SIDDIQUE, KHM; WHAN, BR.

In: Euphytica, Vol. 73, No. 3, 1994, p. 241-254.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ear:stem ratios in breeding populations of wheat: Significance for yield improvement.

AU - SIDDIQUE, KHM

AU - WHAN, BR

PY - 1994

Y1 - 1994

N2 - Earlier studies showed that the ratio of the weight of the wheat ear to stem at anthesis (ear:stem ratio) may give a better indication of potential yield than harvest index because it is determined early in the life cycle and is not affected by post anthesis stress. These studies concluded that selection for high ear:stem ratio at anthesis may lead to further improvement in grain yield of wheat. The present work was undertaken in the field to identify lines varying in ear:stem ratio in breeding populations and to study its implications for yield improvement.At anthesis stem length, ear length, tiller number, dry weight of stem and ear and ear:stem ratio were measured in 14 crosses on F-2 Single plants and F-2 derived lines grown in the F-3, F-4, and F-5 at three locations in Western Australia over four seasons. In addition, biomass, grain yield and yield components were measured on selected crosses at two locations on F-2 derived lines grown in the F-4 and F-5 There was a considerable range of ear:stem ratio between and within the crosses studied. Although ear:stem ratio was strongly correlated with stem length, there was substantial variation within stem length classes. Ear:stem ratio had a high mean broad sense heritability (82%), whereas HI grain yield and above ground biomass had lower heritabilities, 68, 55 and 35% respectively. Ear:stem ratio was strongly correlated between generations and sites indicating stability of this character. Ear:stem ratio had a significant positive correlation with grain yield, HI, grains per ear and per m(2). The correlation of grain yield with HI was equal or slightly higher than that of grain yield with ear:stem ratio.Ear:stem ratio offers promise as a predictor of HI and yield potential where post-anthesis moisture stress can influence HI. Ear:stem ratio measurement is unlikely to be adopted for selection purposes in routine breeding programs, as it is laborious and time consuming. However, ear:stem ratio could be used to identify superior parental genotypes and early generation selections from special crosses in terms of its ability to partition assimilate.

AB - Earlier studies showed that the ratio of the weight of the wheat ear to stem at anthesis (ear:stem ratio) may give a better indication of potential yield than harvest index because it is determined early in the life cycle and is not affected by post anthesis stress. These studies concluded that selection for high ear:stem ratio at anthesis may lead to further improvement in grain yield of wheat. The present work was undertaken in the field to identify lines varying in ear:stem ratio in breeding populations and to study its implications for yield improvement.At anthesis stem length, ear length, tiller number, dry weight of stem and ear and ear:stem ratio were measured in 14 crosses on F-2 Single plants and F-2 derived lines grown in the F-3, F-4, and F-5 at three locations in Western Australia over four seasons. In addition, biomass, grain yield and yield components were measured on selected crosses at two locations on F-2 derived lines grown in the F-4 and F-5 There was a considerable range of ear:stem ratio between and within the crosses studied. Although ear:stem ratio was strongly correlated with stem length, there was substantial variation within stem length classes. Ear:stem ratio had a high mean broad sense heritability (82%), whereas HI grain yield and above ground biomass had lower heritabilities, 68, 55 and 35% respectively. Ear:stem ratio was strongly correlated between generations and sites indicating stability of this character. Ear:stem ratio had a significant positive correlation with grain yield, HI, grains per ear and per m(2). The correlation of grain yield with HI was equal or slightly higher than that of grain yield with ear:stem ratio.Ear:stem ratio offers promise as a predictor of HI and yield potential where post-anthesis moisture stress can influence HI. Ear:stem ratio measurement is unlikely to be adopted for selection purposes in routine breeding programs, as it is laborious and time consuming. However, ear:stem ratio could be used to identify superior parental genotypes and early generation selections from special crosses in terms of its ability to partition assimilate.

KW - BREEDING POPULATIONS

KW - EAR-STEM RATIO

KW - GRAIN YIELD

KW - HARVEST INDEX

KW - HERITABILITY

KW - TRITICUM AESTIVUM

KW - WHEAT

KW - INCREASING EARLY VIGOR

KW - GRAIN-YIELD

KW - SPRING WHEAT

KW - GENETIC IMPROVEMENTS

KW - TOTAL BIOMASS

KW - SELECTION

KW - LINES

KW - OLD

KW - ENVIRONMENT

U2 - 10.1007/BF00036703

DO - 10.1007/BF00036703

M3 - Article

VL - 73

SP - 241

EP - 254

JO - Euphytica: international journal on plant breeding

JF - Euphytica: international journal on plant breeding

SN - 0014-2336

IS - 3

ER -