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Articles by Qing Chen
Total Records ( 2 ) for Qing Chen
  Yong Zhang , Ya Luo , Yan-Xia Hou , Hao Jiang , Qing Chen and Hao-Ru Tang
  Changes in the contents of H2O2, malondialdehyde (MDA) and endogenous antioxidants, the activities of enzymes involving cell defense in leaves of strawberry (FragariaAnanassa Duch.) plantlets under chilling acclimation and de-acclimation were studied. With the increase of chilling acclimation times, the contents of H2O2 and MDA increased to a certain degree and then decreased. The activities of cell defence enzymes, such as Superoxide Dismutase (SOD), catalase (CAT), peroxidase (POD), Dehydroascorbate Reductase (DHAR), Monodehydroascorbate Reductase (MDAR), Ascorbate Peroxidase (APX) and glutathione reductase (GR) were gradually increased to a certain degree and then kept at a high level. And it increased the contents of reduced ascorbate (ASA), dehydroascorbate (DHA) and reduced glutathione (GSH). Our results clearly suggested that cold-hardening triggers an increase of reactive oxygen species (ROS) and the early accumulation of ROS in plants might lead to the production of antioxidant defense system. Based on the obtained results, it can be concluded that the ascorbate-glutathione (ASA-GSH) cycle plays an impotant role in enhancement of chilling resistance of strawberry during chilling acclimation.
  Ma Zhao-cai , Qing Chen and You-liang Zheng
  The allelic compositions at Gli-A1 and Gli-A2 loci were investigated in 113 accessions of einkorn wheat by using Acid Polyacrylamide Gel Electrophoresis (APAGE). A total of 42 alleles were identified and the mean genetic variation index was 0.9418 at Gli-A1 and Gli-A2 loci in 113 accessions of einkorn wheat. A total of 37, 33 and 38 alleles were identified and the mean genetic variation indexes were 0.9378, 0.9314 and 0.9251 at Gli-A1 and Gli-A2 loci in the accessions of T. monococcum ssp. boeoticum, T. monococcum ssp. monococcum and T. urartu, respectively. In some accessions, the gliadin genes can`t be identified at Gli-A1 or Gli-A2 loci. It indicated that there might exist some new gliadin genes in these accessions. The results indicated that higher gliadin diversity was present in einkorn wheat. In addition, these accessions analyzed could also be used as genetic resource to improve the quality and to broaden the genetic base of common wheat.
 
 
 
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