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Articles by Wen Jiang
Total Records ( 2 ) for Wen Jiang
  Wen Jiang and Renee Lafitte
  In this study, the effect of exogenous ABA on radicle and plumule growth at germination stage was investigated, compared with PEG osmotic stress culture condition and the consistency between genotypic variation in exogenous ABA and PEG sensitivity at germination stage and in water deficit treatment at reproductive stage in the field was evaluated. Fifteen rice (Oryza sativa L.) cultivars with different drought resistant ability were studied, 7.8x10-6 mol L-1 ABA and 30% PEG1500 (-1.1 MPa) were used to culture the germinated seeds for 5 days and the length, fresh and dry weight of radicle and plumule were measured and compared with normal condition (distilled water). In the field water stress experiment, drip irrigation was served for all plots every other day and water was discontinued for 14 days when the flag leaf reached stage 0 for the main stems in the plot. In this study, both PEG and ABA applied could inhibit the growth of plumule and radicle and significant difference existed among genotypes in the reduction rate of plumule and radicle. While for most of the tested genotypes, the response to ABA was similar to PEG and water stress in the field as well, which indicated the genotypes variation and ranking for the treatment with ABA based on the reduction rate of radicle and plumule growth parameters and with PEG based on reduction rate of plumule growth were rather similar to the same genotypes in field water deficit experiment based on the yield reduction rate. So exogenous ABA at germination stage could be and even more effective compared with PEG to quantify the drought resistance among genotypes in rice.
  Qi Lin , Wen Jiang , Yumei Zhang , Yiguo Liu and Lingyan Li
  Under regulated deficit irrigation at different stages, the changes of endogenous hormones (ABA and ZR) in developing grain were studied to identify how hormonal levels regulated the effect of water deficit on grain filling in winter wheat. Six irrigation treatments (A, B, C, D, E, F) with water deficit imposed at different development stages were set up. When water deficit was imposed at both vegetative and reproductive stages (booting or flowering) (A, B, C treatments), grain-filling rate obviously decreased and grain-filling period was shortened. On the other hand, ABA content in developing grain was obviously higher and increased faster, whereas, ZR content and the ratio of ZR to ABA in grain were much lower and increased more slowly, compared with those under the treatments (D, E, F) of no water deficit imposed at reproductive stage. With all irrigation treatments, ZR in grain reached the peak at 7 days after flowering, then declined. Among those irrigation treatments without water deficit imposed at reproductive stage, there was no significant difference in grain yield and the irrigation treatment D with water deficit conducted at both regreening and jumping stages could be suggested as a most saving and high yield irrigation way in winter wheat.
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