Wheat spike fertility: inheritance and relationship with spike yield components in early generations

Martino, Diana L.; Abbate, Pablo Eduardo; Cendoya, María Gabriela; Gutheim, Florencia; Mirabella, Nadia Estefania; Pontaroli, Ana Clara

doi:10.1111/pbr.12262

Cited by 31 publications

(50 citation statements)

References 20 publications

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“…Water stress during meiosis significantly reduced ( p < 0.01) seed set compared to non-stressed plants. For the 46 tested wheat genotypes, the mean seed set under non-stressed conditions was 68%, because not all fertile florets had the potential of setting into grains, similar result has been previously reported in Ferrante et al (2013) where increase in nitrogen availability affected the number of fertile florets and the number of grains the florets produce at maturity - the relationship of wheat spike fertility and seed set was also reported by Martino et al (2015). Under stressed conditions the mean seed set was reduced to 52%.…”

Section: Resultssupporting

confidence: 81%

Both Male and Female Malfunction Contributes to Yield Reduction under Water Stress during Meiosis in Bread Wheat

et al. 2017

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Water stress during meiosis in wheat is a major constraint to yield especially for the rainfed farming regions. Pollen sterility has been proposed as the most sensitive process leading to low seed set (low % of fertile spikelets), but here we show this is not universal, and that the development of female reproductive parts is equally if not more sensitive than male parts in many wheat cultivars. The first experiment examined water stress during meiosis in 46 wheat genotypes. The reduction in seed set varied widely, ranging from 6 to 48%. The second experiment differentiated the effect of water stress on the male or the female reproductive part in 13 wheat genotypes. Water stress was imposed during meiosis, with plants cross-pollinated 5 days later with pollen from stressed or unstressed plants used to pollinate emasculated stressed or unstressed female parts. Seed set and kernel weight were measured at maturity. Contrary to the well-held view that the male reproductive part is the major contributor to seed set reduction when water stress is experienced during meiosis, the stressed-female part was also a predominant contributor in four wheat genotypes among the 13 genotypes examined. This strongly indicates that both male and female parts are responsible for yield reduction when water-stressed during meiosis and suggests that it may be possible to breed tolerant wheat cultivars combining tolerance from both male and female reproductive parts.

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Section: Resultssupporting

confidence: 81%

Both Male and Female Malfunction Contributes to Yield Reduction under Water Stress during Meiosis in Bread Wheat

et al. 2017

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“…In a paper that was just published, Mirabella et al () reported new results confirming wide variation in fruiting efficiency among modern cultivars and revealing that this variation was consistently larger than GxE interaction.…”

Section: Genetic Variation In Fruiting Efficiency Within Elite Germplasmmentioning

confidence: 88%

“…In a paper that just became available, Martino et al () also found that fruiting efficiency exhibited transgressive segregation and would be reasonably heritable.…”

Section: Genetic Variation In Fruiting Efficiency Within Elite Germplasmmentioning

confidence: 99%

Fruiting efficiency: an alternative trait to further rise wheat yield

Slafer

Elía

Savin

et al. 2015

Food and Energy Security

129

107

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Further improvements in wheat yields are critical, for which increases in grain number would be required. In the recent past, higher grain number was achieved through increased growth of the juvenile spikes before anthesis, due to the reduction in stem growth. As current cultivars have already an optimum height, alternatives must be identified for further increasing grain number. One of them is increasing fruiting efficiency (grains set per unit of spike dry weight at anthesis). Fruiting efficiency is the final outcome of the fate of floret development and differences in this trait within modern cultivars would be related to higher survival of floret primordia. Then there are two alternative physiological pathways to improve fruiting efficiency by allowing a normal development of most vulnerable floret primordia: an increased allocation of assimilates for the developing florets before anthesis, or reduced demand of the florets for maintaining their normal development. Both alternatives may be possible, and it might be critical to recognize which of them is the actual cause of differences in fruiting efficiency. When considering this trait in breeding we must be aware of potential trade‐offs and therefore it must be avoided that increases in fruiting efficiency be constitutively related to decreases in either spike dry weight at anthesis or grain weight. In this review we described fruiting efficiency and its physiological bases, analyzing genetic variation and considering potential drawbacks that must be taken into account to avoid increases in fruiting efficiency being compensated by other traits.

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“…The environmental effects on spikes are very likely to be compensated by the modification of other parts within the same plant. The influence on spike components is possibly compensated by the responses of other components within the same spike (Dreccer et al, 2009;Gaju et al, 2009;Gonzalez et al, 2011;Lazaro & Abbate, 2012;Reynolds et al, 2012;Nagel et al, 2013;Martino et al, 2015). Therefore, grain yield-related traits do not always reflect the overall information concerning environmental effects, because the environmental influence on the grain weight per spike is often partly offset by 'compensations'.…”

Section: Discussionmentioning

confidence: 99%

Genome‐wide association analyses of 54 traits identified multiple loci for the determination of floret fertility in wheat

et al. 2016

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Increasing grain yield is still the main target of wheat breeding; yet today's wheat plants utilize less than half of their yield potential. Owing to the difficulty of determining grain yield potential in a large population, few genetic factors regulating floret fertility (i.e. the difference between grain yield potential and grain number) have been reported to date. In this study, we conducted a genome-wide association study (GWAS) by quantifying 54 traits (16 floret fertility traits and 38 traits for assimilate partitioning and spike morphology) in 210 European winter wheat accessions. The results of this GWAS experiment suggested potential associations between floret fertility, assimilate partitioning and spike morphology revealed by shared quantitative trait loci (QTLs). Several candidate genes involved in carbohydrate metabolism, phytohormones or floral development colocalized with such QTLs, thereby providing potential targets for selection. Based on our GWAS results we propose a genetic network underlying floret fertility and related traits, nominating determinants for improved yield performance.

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Wheat spike fertility: inheritance and relationship with spike yield components in early generations

Cited by 31 publications

References 20 publications

Both Male and Female Malfunction Contributes to Yield Reduction under Water Stress during Meiosis in Bread Wheat

Both Male and Female Malfunction Contributes to Yield Reduction under Water Stress during Meiosis in Bread Wheat

Fruiting efficiency: an alternative trait to further rise wheat yield

Genome‐wide association analyses of 54 traits identified multiple loci for the determination of floret fertility in wheat

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