| Genetic analysis of WSC’s accumulation and transport characteristics in different vegetative organs in wheat natural population under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2018.04.38 |
| Key Words: wheat natural population drought stress WSC accumulation and remobilization genetic diversity |
| Author Name | Affiliation | | ZHANG Jia-le | Gansu Provincial Key Laboratory of Aridland Crop Science / College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Meng-fei | Gansu Provincial Key Laboratory of Aridland Crop Science / College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YANG De-long | Gansu Provincial Key Laboratory of Aridland Crop Science / College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LIU Yuan | Gansu Provincial Key Laboratory of Aridland Crop Science / College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Jing-jing | Gansu Provincial Key Laboratory of Aridland Crop Science / College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHENG Hong-bo | Gansu Provincial Key Laboratory of Aridland Crop Science / College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHANG Lei | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHAI Shou-xi | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A natural population composed of 165 wheat cultivars/lines was used to study genetic characteristics of water soluble carbohydrates (WSC)'s accumulation, transport rate, its contribution to grain mass, and the grain weight of the main spike at the different growth stages, as well as the correlations between the target traits under drought stress (DS) and well-watered (WW) conditions. The results showed that under the two types of water conditions, the phenotypic variation of each trait in the natural population was extensiveand the coefficients of variations ranged from 7.11% to 68.55% under DS and from 9.50% to 57.37% under WW. The diversity index varied from 0.61 to 0.93 under DS and from 0.62 to 0.88 under WW. The heritabilityvariedfrom 0.24 to 0.53. The phenotypic value of each target trait was significantly affected by the developmental stage, the organ and the water environment(F=1.95**~32 775.74**). WSC content was significantly affected by developmental stageand organs(F=32 775.74**,11 223.18**), WSC transport rate was significantly affected by water environments (F=245.07**,274.61**), and WSC contribution rate to grain filling was significantly affected by organs (F=1 482.96**,390.15**). There was a significant or highly significant positive correlation between the WSC content and grain weight per main spike in the middle grain-filling stage (r=0.15**~0.36**), with higher correlation coefficient under the DS (r=0.21**~0.36**). The phenotypic variation coefficient, diversity index and correlation coefficient with othertrait phenotypeof WSC-related traits reached the highest in penultimate internodes. Based on the cluster analysis of WSC-accumulation-related traits in penultimate internodes, 15 accessions were selected with higher WSC content in grain-filling stage and higher WSC remobilization rate and contribution rate in pre-anthesis stage. |
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