Variability in the Duration of Stem Elongation in Wheat Genotypes and Sensitivity to Photoperiod and Vernalization

Whitechurch, E. M.; Slafer, Gustavo A.; Miralles, Daniel J.

doi:10.1111/j.1439-037x.2007.00259.x

Cited by 34 publications

(24 citation statements)

References 25 publications

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“…1992, Slafer and Rawson 1994, Gomez McPherson and Richards 1997, Whitechurch and Slafer 2001, 2002, Gonzalez et al. 2002, 2003, Whitechurch et al 2007). However, these particular studies were not aimed at screening a large number of cultivars for this variability, as is the case in the present paper.…”

Section: Resultsmentioning

confidence: 99%

Variability in the Duration of Stem Elongation in Wheat and Barley Genotypes

Whitechurch¹,

Slafer²,

Miralles³

2007

J Agronomy Crop Science

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The stem elongation phase in wheat (Triticum aestivum, L.) and barley (Hordeum vulgare) is important for yield determination as it is the phase when stems and spikes grow actively. A longer duration of this phase could hypothetically increase assimilate availability, fertile florets at anthesis and final grain number. Argentine commercial wheat and barley cultivars were studied to analyse the range of genetic variability existing in the duration of the stem elongation phase, in particular, considering cultivars with similar time to anthesis. It was found that cultivars differing in time to anthesis, not only differed in the length of their early, mostly vegetative phases but also in the stem elongation phase (range 301–535 °C day for wheat and 252–404 °C day for barley), and that the partitioning of a similar time to anthesis into phases was substantially different between cultivars. Various studies with other cultivars were re‐analysed, showing that the stem elongation phase did present genetic variability as well. As a preliminary step to identifying the genetic causes behind this variability, an approximation to the possible photoperiod and/or vernalization sensitivities of this large group of Argentine cultivars was presented, by comparing behaviour in two contrasting sowing dates. This has proved useful to breeders since there have been no other previous studies including this large number of commercial cultivars.

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Section: Resultsmentioning

confidence: 99%

Variability in the Duration of Stem Elongation in Wheat and Barley Genotypes

Whitechurch¹,

Slafer²,

Miralles³

2007

J Agronomy Crop Science

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“…Embora a sensibilidade à vernalização em trigo seja considerada restrita à fase vegetativa e, quando muito, ao início da fase reprodutiva, González et al (2002) encontraram resposta à vernalização no final da fase reprodutiva. Whitechurch et al (2007) ampliaram esse tipo de estudo e discutiram que a etapa final da fase reprodutiva em trigo é insensível á vernalização, com respostas, nessa etapa, muito menores que as obtidas em fases anteriores. A efetiva comprovação experimental dessa resposta, nos trigos brasileiros, vai requerer estudos adicionais com os genótipos testados, em que se deve buscar contornar efeitos de interações não controladas, como a de temperatura e fotoperíodo, que podem ter influenciado o tipo de resposta obtida.…”

Section: Resultsunclassified

Respostas fenológicas de cultivares brasileiras de trigo à vernalização e ao fotoperíodo

Ribeiro

Cunha

Pires

et al. 2009

Pesq. agropec. bras.

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Phenological responses of Brazilian wheat cultivars to vernalization and photoperiodThere was an interaction between photoperiod and cultivar cycle for the first sowing date. For all the cultivars, the cycle was reduced with the increase of the photoperiod. However, for the second and third sowing dates, there was also an interaction between cultivars and vernalization. These variables accelerated the crop cycle, and affected the duration of important subperiods for the composition of yield grain components.

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“…Many authors have dealt with the effect of the starting date and length of individual phenophases on yield components in terms of photoperiod and temperature (González et al, 2002(González et al, , 2003b(González et al, , 2005Whitechurch et al, 2007). By contrast, very little information is available on possible correlations between the changeable environmental factors (photoperiod and temperature) and yield components in field sowing experiments.…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of the Developmental Traits and Yield Components of Bread Wheat under Field Conditions in Several Years of Multi‐Sowing Time Experiments

et al. 2019

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The main aim of the experiments was to demonstrate the possible correlation between developmental and morphological traits and yield components under variable climatic conditions. For this purpose, a collection of 188 wheat (Triticum aestivum L.) genotypes with a heterogeneous gene pool was included in a 3‐yr field experiment applying normal and late sowing dates each year. Under these conditions, almost all the traits were significantly influenced by the genotype, which had the greatest effect on the morphological traits and yield components (explaining 20–58 and 50–60% of the phenotypic variance for the two trait groups, respectively). In the case of plant development, however, the year effect, particularly in the late sowing treatment, was more significant than that of the genotype. Sowing date had the strongest effect on the early developmental phases, explaining 50% of the phenotypic variance, whereas the year had a significant influence on the late developmental phases, being responsible for 37 to 53% of the phenotypic variance. The turning point between the two factors was during the first phase of rapid stem elongation. The environmental driven variation in developmental patterns led to significant variation in yield‐related traits, which ranged from 4.6 (average thousand‐kernel weight) to 16.3% (average seed number) with normal sowing, and from 2.9 (average seed weight) to 29.4% (average thousand‐kernel weight) under late sowing conditions. The significance of the two intervals, from sowing to the start of rapid (intensive) stem elongation and from the start of stem elongation to the boot stage (Z49), was most apparent in the case of yield‐related traits.

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Variability in the Duration of Stem Elongation in Wheat Genotypes and Sensitivity to Photoperiod and Vernalization

Cited by 34 publications

References 25 publications

Variability in the Duration of Stem Elongation in Wheat and Barley Genotypes

Variability in the Duration of Stem Elongation in Wheat and Barley Genotypes

Respostas fenológicas de cultivares brasileiras de trigo à vernalização e ao fotoperíodo

Comparative Study of the Developmental Traits and Yield Components of Bread Wheat under Field Conditions in Several Years of Multi‐Sowing Time Experiments

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