Grain yield in cereal crops is a complex trait controlled by multiple genes and influenced by developmental processes and environment. Here we report the effects of alleles Rht8 and Ppd-D1 a on plant height, time to h...Grain yield in cereal crops is a complex trait controlled by multiple genes and influenced by developmental processes and environment. Here we report the effects of alleles Rht8 and Ppd-D1 a on plant height, time to heading, and grain yield and its component traits. Association analysis and quantitative trait locus mapping using phenotypic data from 15 environments led to the following conclusions. First, both Rht8 and Ppd-D1 a reduce plant height. However, Ppd-D1 a but not Rht8 causes earlier heading.Second, both Rht8 and Ppd-D1 a promote grain yield and affect component traits. Their combined effects are substantially larger than those conferred by either allele alone.Third, promotion of grain yield by Rht8 and Ppd-D1 a is through increasing fertile spikelet number. We speculate that Rht8 and Ppd-D1 a act independently and additively in control of plant height, grain yield and yield component. Combination of the two alleles is desirable for adjusting plant height and enhancing grain yield and abiotic stress tolerance.展开更多
Improved adaptation of winter wheat （Triticum aestivum L.） to drought and heat may be influenced by days to heading, plant height, biomass, canopy temperature （CT） at grain fil ing, and rate of senescence. This st...Improved adaptation of winter wheat （Triticum aestivum L.） to drought and heat may be influenced by days to heading, plant height, biomass, canopy temperature （CT） at grain fil ing, and rate of senescence. This study shows that, under supplemental irrigation or rainfed conditions, days to heading and plant height together explain up to 68%of grain yield （GY） variation, and these associations were further confirmed in several locations across West and Central Asia. Days to heading can be slightly reduced below that of check line Karahan to further improve GY while avoiding the effect of late frosts. Plant height has been decreased in recent germplasm, but further reductions below that of check line Karahan could stil improve GY in a wide range of environ-ments. However, in Iranian sites, tal er genotypes showed better adaptation with higher biomass and increased reserves＆amp;nbsp;for grain fil ing. Canopy temperature and rate senescence were not associated with GY. A normalized difference vegetation index, used to estimate biomass （Feekes stages 4-5）, had intermediate heritability across environments and correlated positively with GY under low plant density and should be explored further as a tool for early selection.展开更多
基金supported by the Ministry of Science and Technology of China (2017YFD0101000)Science and Technology Service Network Program (STS Program) of Chinese Academy of Sciences (KFJ-STS-ZDTP-024)National Natural Science Foundation of China (31371611)
文摘Grain yield in cereal crops is a complex trait controlled by multiple genes and influenced by developmental processes and environment. Here we report the effects of alleles Rht8 and Ppd-D1 a on plant height, time to heading, and grain yield and its component traits. Association analysis and quantitative trait locus mapping using phenotypic data from 15 environments led to the following conclusions. First, both Rht8 and Ppd-D1 a reduce plant height. However, Ppd-D1 a but not Rht8 causes earlier heading.Second, both Rht8 and Ppd-D1 a promote grain yield and affect component traits. Their combined effects are substantially larger than those conferred by either allele alone.Third, promotion of grain yield by Rht8 and Ppd-D1 a is through increasing fertile spikelet number. We speculate that Rht8 and Ppd-D1 a act independently and additively in control of plant height, grain yield and yield component. Combination of the two alleles is desirable for adjusting plant height and enhancing grain yield and abiotic stress tolerance.
基金The Mexican Ministry of Agriculture,Livestock,Rural Development,Fisheries and Food(SAGARPA) via MasAgro Seeds of Discovery is acknowledged for financial support
文摘Improved adaptation of winter wheat （Triticum aestivum L.） to drought and heat may be influenced by days to heading, plant height, biomass, canopy temperature （CT） at grain fil ing, and rate of senescence. This study shows that, under supplemental irrigation or rainfed conditions, days to heading and plant height together explain up to 68%of grain yield （GY） variation, and these associations were further confirmed in several locations across West and Central Asia. Days to heading can be slightly reduced below that of check line Karahan to further improve GY while avoiding the effect of late frosts. Plant height has been decreased in recent germplasm, but further reductions below that of check line Karahan could stil improve GY in a wide range of environ-ments. However, in Iranian sites, tal er genotypes showed better adaptation with higher biomass and increased reserves＆amp;nbsp;for grain fil ing. Canopy temperature and rate senescence were not associated with GY. A normalized difference vegetation index, used to estimate biomass （Feekes stages 4-5）, had intermediate heritability across environments and correlated positively with GY under low plant density and should be explored further as a tool for early selection.
