Selection for high grain number per unit stem length through four generations from mutants in a durum wheat population to increase yields of individual plants and crops

Pedró, Anna; Savin, Roxana; Parry, M. A. J.; Slafer, Gustavo A.

doi:10.1016/j.fcr.2012.01.016

Cited by 25 publications

(15 citation statements)

References 41 publications

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“…Similarly, Pedro et al. () showed that selecting divergently for (a proxy to) fruiting efficiency, after five generations there were two clear populations of either lower yielding with fewer grains or higher yielding with more grains than commercial controls used in the study.…”

Section: Potential Drawbacksmentioning

confidence: 78%

“…Pedro et al. () have conducted an experimental selection procedure (selecting divergently for higher or lower fruiting efficiency) on segregating mutants (Fig. ).…”

Section: Contributions Of Fruiting Efficiency To Wheat Breedingmentioning

confidence: 99%

“…As determination of fruiting efficiency is destructive it would be impracticable in early generations when segregation is high and, therefore, the authors used the number of grains per unit stem length as a close proxy (see Pedro et al. ). The process started with a selection made on the M2 generation at RRes under glasshouse conditions and then continued for three further generations (M3, M4, and M5) under field conditions at the University of Lleida (UdL), although the M5 generation was grown and selected at RRes under glasshouse conditions as well.…”

Section: Contributions Of Fruiting Efficiency To Wheat Breedingmentioning

confidence: 99%

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Fruiting efficiency: an alternative trait to further rise wheat yield

Slafer

Elía

Savin

et al. 2015

Food and Energy Security

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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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Section: Potential Drawbacksmentioning

confidence: 78%

“…Pedro et al. () have conducted an experimental selection procedure (selecting divergently for higher or lower fruiting efficiency) on segregating mutants (Fig. ).…”

Section: Contributions Of Fruiting Efficiency To Wheat Breedingmentioning

confidence: 99%

Section: Contributions Of Fruiting Efficiency To Wheat Breedingmentioning

confidence: 99%

See 1 more Smart Citation

Fruiting efficiency: an alternative trait to further rise wheat yield

Slafer

Elía

Savin

et al. 2015

Food and Energy Security

Self Cite

129

107

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“…The dynamics of SPAD values through grain filling was determined by fitting linear or bi-linear regressions (the former in very few occasions in which senescence had started at silking). With these regressions we then estimated the "area under the curve" (AUC) of the SPAD readings as a single estimate of the treatments effects on senescence (Pedro et al, 2012), in which the lower the value of the AUC the stronger the treatment effect on senescence.…”

Section: Sampling Measurements and Analysesmentioning

confidence: 99%

Yield response to heat stress as affected by nitrogen availability in maize

Ordóñez

Savin

Cossani

et al. 2015

Field Crops Research

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“…Due to its relevance, several papers have recently been published reviewing the physiological bases of yield determination (Slafer et al ., 2005; Fischer, 2011; Foulkes et al ., 2011). As yield is linearly related to grain number per unit of land area, understanding the mechanisms controlling grain number determination may be relevant to increase yield further (Fischer, 2011; Pedro et al ., 2012). In turn, it has been established in a wide range of conditions that the number of fertile florets at anthesis is closely related to the number of grains at maturity; due to genotypic differences (Miralles et al ., 1998) or environmental effects (Serrago et al ., 2008; González et al ., 2011).…”

Section: Introductionmentioning

confidence: 99%

Floret development and grain setting differences between modern durum wheats under contrasting nitrogen availability

Ferrante

Savin

Slafer

2012

EXBOTJ

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Wheat yield depends on the number of grains per square metre, which in turn is related to the number of fertile florets at anthesis. The dynamics of floret generation/degeneration were studied in contrasting conditions of nitrogen (N) and water availability of modern, well-adapted, durum wheats in order to understand further the bases for grain number determination. Experiments were carried out during the 2008–2009 and 2009–2010 growing seasons at Lleida (NE Spain). The first experiment involved four cultivars (Claudio, Donduro, Simeto, and Vitron) and two contrasting N availabilities (50 kgN ha–1 and 250 kgN ha–1; N50 and N250) while experiment 2 included the two cultivars most contrasting in grain setting responsiveness to N in experiment 1, and two levels of N (N50 and N250), under irrigated (IR) and rainfed (RF) conditions. In addition, a detillering treatment was imposed on both cultivars under the IR+N250 condition. The number of fertile florets at anthesis was increased by ~30% in response to N fertilization (averaging across treatments and spikelet positions). The effect of N and water availability was evident on floret developmental rates from the third floret primordium onwards, as these florets in the central spikelets of all genotypes reached the stage of a fertile floret in N250 while in N50 they did not. In this study, clear differences were found between the cultivars in their responsiveness to N by producing more fertile florets at anthesis (through accelerating developmental rates of floret primordia), by increasing the likelihood of particular grains to be set, or by both traits.

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Selection for high grain number per unit stem length through four generations from mutants in a durum wheat population to increase yields of individual plants and crops

Cited by 25 publications

References 41 publications

Fruiting efficiency: an alternative trait to further rise wheat yield

Fruiting efficiency: an alternative trait to further rise wheat yield

Yield response to heat stress as affected by nitrogen availability in maize

Floret development and grain setting differences between modern durum wheats under contrasting nitrogen availability

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