title: Effects of favorable alleles for water-soluble carbohydrates at grain filling on grain weight under drought and heat stresses in wheat.
abstract: Drought, heat and other abiotic stresses during grain filling can result in reductions in grain weight. Conserved water-soluble carbohydrates (WSC) at early grain filling play an important role in partial compensation of reduced carbon supply. A diverse population of 262 historical winter wheat accessions was used in the present study. There were significant correlations between 1000-grain weight (TGW) and four types of WSC, viz. (1) total WSC at the mid-grain filling stage (14 days after flowering) produced by leaves and non-leaf organs; (2) WSC contributed by current leaf assimilation during the mid-grain filling; (3) WSC in non-leaf organs at the mid-grain filling, excluding the current leaf assimilation; and (4) WSC used for respiration and remobilization during the mid-grain filling. Association and favorable allele analyses of 209 genome-wide SSR markers and the four types of WSC were conducted using a mixed linear model. Seven novel favorable WSC alleles exhibited positive individual contributions to TGW, which were verified under 16 environments. Dosage effects of pyramided favorable WSC alleles and significantly linear correlations between the number of favorable WSC alleles and TGW were observed. Our results suggested that pyramiding more favorable WSC alleles was effective for improving both WSC and grain weight in future wheat breeding programs.
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China; College of Agronomy, Shanxi Agricultural University, Taigu, China.
authors.forename: Weiyu
authors.initials: W
authors.lastname: Li
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Chang
authors.affiliation: College of Agronomy, Shanxi Agricultural University, Taigu, China.
authors.forename: Runzhi
authors.initials: R
authors.lastname: Li
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Ruilian
authors.initials: R
authors.lastname: Jing
mesh_terms: D000483:Alleles; D001947:Breeding; D002241:Carbohydrates / Q000235:genetics*; D055864:Droughts; D002523:Edible Grain / Q000235:genetics*; D035264:Flowers / Q000235:genetics; D006358:Hot Temperature; D018515:Plant Leaves / Q000235:genetics; D012995:Solubility; D014908:Triticum / Q000235:genetics*; D014867:Water
chemical_list: D002241:Carbohydrates; D014867:Water