The Effect of Plant Size on Wheat Response to Agents of Drought Stress. II. Water Deficit, Heat and ABA

Blum, A.; Sullivan, C. Y.; Nguyen, Huy

doi:10.1071/pp96023

Cited by 38 publications

(36 citation statements)

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“…However, variations in plant height among dwarf cultivars highlight the role of the genetic background of the cultivar, source and/or level of expression of dwarfing genes in regulating plant height (Morgan et al 1990;Ehdaie and Waines 1996;Blum et al 1997b). This indicates that a range of genetic material differing in plant height has been used in the present study.…”

Section: Space-planted Trialmentioning

confidence: 98%

“…Based on studies in cereals (Ehdaie and Waines 1996; Blum et al 1997b) variations in agronomic performance of different stature sunflower has been predicted; however, very little agronomic information is available on within-and between-height-class variation comparisons in sunflower. Therefore, the objectives of this study were (i) to compare the biomass production, biomass distribution, and yield formation of standard height compared with dwarf sunflower cultivars, and (ii) to understand the water use and water use efficiency of different height sunflower cultivars.…”

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confidence: 99%

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Agronomic performance of different stature sunflower cultivars under different levels of interplant competition

Angadi¹,

Entz²

2002

Can. J. Plant Sci.

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Angadi, S. V. and Entz, M. H. 2002. Agronomic performance of different stature sunflower cultivars under different levels of interplant competition. Can. J. Plant Sci. 82: 43-52. Early-maturing, short-stature sunflower (Helianthus annuus L.) cultivars improve the adaptability of sunflower to the short growing season of western Canada. However, the agronomic potential of the recently developed dwarf cultivars in comparison to standard-height sunflower is yet to be understood. Multi-environment field studies, consisting of space-planted trials, where interplant competition was low, and agronomy trials, where plants were grown at commercial population densities, were conducted in southern Manitoba to compare the yield formation of dwarf hybrids (sunwheats; , and dwarf open-pollinated cultivars (sunola; Aurora and Sierra) with that of standard-height cultivars (IS-6111 and SF-187). In space-planted trials, dry matter (DM) accumulation and water use efficiency for dry matter production (WUE DM ) decreased as plant height decreased. In agronomy trials, differences in DM and WUE DM among the different height classes were masked. The diversion of assimilate from stem to head depended on the genetic background, while the efficiency of utilising assimilate in the head for seed production was lower in dwarf cultivars. Only one of the four dwarf cultivars (SW-103) displayed a higher harvest index than IS-6111. Higher seed yield for the standard-height cultivar, IS-6111, and the dwarf open-pollinated cultivar, Aurora, compared to other cultivars was attributed to both greater DM and improved DM partitioning. However, variations observed among the dwarf cultivars for DM accumulation and partitioning revealed that the dwarfing gene was not a limiting factor for breeding a dwarf sunflower cultivar with better partitioning of DM along with better yield potential. Dans les essais de culture en touffes, la quantité de matière sèche (MS) accumulée et l'utilisation de l'eau pour la production de matière sèche diminuent avec la taille du plant. Lors des essais agronomiques, l'écart entre ces deux paramètres était masqué chez les tournesols de différentes hauteurs. La diversion des substances assimilées de la tige vers le capitule est commandée par le génome, mais les variétés naines transforment moins efficacement les matières assimilées en graines, dans le capitule. Un seul des quatre cultivars nains (SW-103) présentait un meilleur indice de moisson que la variété IS-6111. Le rendement grainier supérieur du cultivar à taille normale IS-6111 et du cultivar nain à pollinisation libre Aurora est attribuable à une production accrue de MS et à une meilleure répartition de cette dernière. Les variations observées chez les cultivars nains en ce qui concerne l'accumulation et la répartition de la MS indiquent que le gène du nanisme n'interdit pas la sélection d'une variété qui se caractérisera par une meilleure répartition de la MS, donc un rendement supérieur éventuel.Mots clés: Tournesol nain, Sunola, rendement grainier, biomasse, efficie...

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Section: Space-planted Trialmentioning

confidence: 98%

mentioning

confidence: 99%

Agronomic performance of different stature sunflower cultivars under different levels of interplant competition

Angadi¹,

Entz²

2002

Can. J. Plant Sci.

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“…The identification and measurement of traits conferring high temperature tolerance could contribute to understanding the genetic regulation of these traits and the genetic background of heat stress tolerance. Earliness, leaf rolling, early ground cover, shortness and stay-green are known to be associated with heat tolerance [5,6].…”

Section: Introductionmentioning

confidence: 99%

Productivity of a doubled haploid winter wheat population under heat stress

et al. 2012

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Breeding of new winter wheat cultivars with good heat tolerance requires better understanding of the genetic background of heat tolerance. In the present work the effect of heat stress on the 6 th day after heading was investigated in a doubled haploid (DH) population arising from a cross between heat-sensitive (Plainsman V) and heat-tolerant (Mv Magma) cultivars. Averaged over the population, heat stress was found to result in a significant reduction in biomass, grain yield and grain number per plant, and in thousand-kernel weight (TKW) and harvest index. High temperature had the greatest effect on the grain yield, with a drop of 36.2% compared with the control. This could be attributed jointly to significant reductions in the TKW of the main ear and in the grain number of the side tillers. The relationship between the yield parameters was confirmed by the positive correlations obtained for the lines in the population. The diverse levels of heat tolerance in the different lines were confirmed by the significant differences in the reduction in the chlorophyll content (SPAD index) of the flag-leaves and in yield parameters. The changes in yield components in stress condition, however, can be still the most effective tools for heat stress evaluation.

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“…For example, CIMMYT (Reynolds et al, 2001), IRRI (Lafitte et al, 2003) and (Blum and Neguyen, 1997) recommend the use of flowering and maturity dates, changes in stay green (e.g., leaf death score), and low canopy temperature.…”

Section: Indirect Selectionmentioning

confidence: 99%

Improvement of Selection Efficiency in Wheat Genotypes for Variable Rainfed Environments

Mohammadi¹,

Karimizadeh²,

Sabaghnia³

2016

AgricultForest

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SUMMARYMost countries in the world depend primarily on rainfed agriculture for their grain food and there are strong reasons to believe that investments in lowyielding rainfed agriculture could have large impacts on poverty reduction. Most works in crop physiology related to breeding does focus on either yield potential or yield under stressful conditions which may reverse performance in other environments. These finding may explain why past breeding programs have largely not as expected to produce an impact on subsistence agriculture in developing countries. Correlation between the same traits in two environments may be negative or positive, depending on the environment where the experiment was grown. Crop selection in natural rainfall conditions vary in different years with additional stress-managed experiments, particularly when error variance is high and heritability estimate is low, resulted in optimum cultivar selection. These cultivar, yield better than any other available cultivar in high to low rainfall conditions, moreover an economic production under severe drought stress and therefore, increased productivity in a wide range of unpredictable rainfed environments. A researcher can use improved statistical design and analysis techniques, in multienvironments information, and consider secondary traits for making selection decisions. These alternative traits should still be much simpler than the complex genes controlling ultimately yield itself under a wide range of conditions. Earliness, canopy temperature, maintaining high kernel weight and leaf senescence are considered inherent heat and drought tolerance in wheat.

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The Effect of Plant Size on Wheat Response to Agents of Drought Stress. II. Water Deficit, Heat and ABA

Cited by 38 publications

References 0 publications

Agronomic performance of different stature sunflower cultivars under different levels of interplant competition

Agronomic performance of different stature sunflower cultivars under different levels of interplant competition

Productivity of a doubled haploid winter wheat population under heat stress

Improvement of Selection Efficiency in Wheat Genotypes for Variable Rainfed Environments

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