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Articles by Hao-Ru Tang
Total Records ( 3 ) for Hao-Ru Tang
  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 (Fragaria×Ananassa 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.
  Meng Zhang , Hao-Ru Tang , Dan Wang , Shao-Xiong Ren and Ren-Dao Liu
  Softwood and 1-year-old hardwood from 4-year-old mother trees of feijoa cultivar ‘Unique’ were used to study the rooting capacity of cuttings during their development. The result showed that the rooting of softwood cuttings was better than that of hardwood cuttings. The secondary structure of stems and the development process of adventitious root were observed by means of paraffin section and microscopy on feijoa cuttings. The result of the observation showed that the adventitious root primordium of feijoa cuttings is a type of induced root primordium. This adventitious root primordium originated from the junction of the vascular cambium and pith rays. There were cyclical and sequential sclerenchyma cells in the phloem and no root primordium in the stems. The adventitious roots of cuttings generated from the edge of the cut section to 0.1-2 cm above the cut. These structural features may be one of the main reasons that our feijoa cuttings showed a low rooting rate.
  Xiao-li Dong , Hao-Ru Tang , Ling Li , Xiao-Rong Wang , Juan Duan and Qin Chen
  In this study, the genetic diversity and relationship of 18 bramble cultivars and 8 materials from Rubus coreanus were analyzed by RAPD markers. Of the 85 random primers screened, 20 primers gave reproducible and polymorphic bands. Total 251 bands were generated by using 20 RAPD primers, of which 235 (93.6%) were polymorphic. The average number of bands generated per primer was 12.5 with a range from 5-25. The results showed that the genetic distance between Coreanus 3 and 4, both collected in Xichong County, Sichuan Province, was the nearest, while the genetic distance between yellow raspberry ‘Kiwigold’ and blackberry ‘Olallie’ was the farthest. The dendrogram of cluster analysis showed that raspberry cultivars and R. coreanus had close genetic relationship, since they clustered into a group. Black raspberry ‘Bristol’ and blackberry cultivars clustered into another group. The genetic relationships and diversity within the cultivars or materials from R. coreanus was complex, for they didn’t cluster together according to their fruit color or original place.
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