http://localhost:80/xmlui/handle/123456789/14698 2026-02-24T00:38:15Z 2026-02-24T00:38:15Z ZHANG, LIXIN WANG, KAI ZHANG, XIFENG LU, LIXIA LI, YUNFEI GAO, MEI WANG, CUIYUN HU, JINJIANG LIANG, ZONGSUO http://localhost:80/xmlui/handle/123456789/16537 2023-01-20T09:36:43Z 2011-12-20T00:00:00Z

Title: ROLE OF NITRATE NUTRITION IN ALLEVIATION OF THE ADVERSE EFFECTS OF DROUGHT STRESS ON MAIZE CULTIVARS: BIOMASS PRODUCTION AND ANTIOXIDATIVE CAPACITY Authors: ZHANG, LIXIN; WANG, KAI; ZHANG, XIFENG; LU, LIXIA; LI, YUNFEI; GAO, MEI; WANG, CUIYUN; HU, JINJIANG; LIANG, ZONGSUO Abstract: Optimal nitrogen (N) nutrition has been shown to alleviate the negative effects of drought stress (DS) on plants. The mechanisms of beneficial effect of nitrogen form are not conclusive. In this study, the effects of different ratios of nitrate (NO3 - ) to ammonium (NH4 + ) nutrition on the growth and oxidative damage of two maize cultivar i.e. Zhengdan 958 (ZD958) and Jundan 20 (JD20) were investigated under DS and non-DS in nutrient solution. The activities of superoxide dismutase (SOD) and catalase (CAT) increased, while that of peroxidase (POD) remained unchanged in ZD958 with supplies of NO3 - : NH4 + ratios of either 100:0 or 50:50, while in NO3 - : NH4 + ratio of 0:100 in ZD958 and all NO3 : NH4 + ratios in JD20 all the enzymes showed decreased activities compared to control. Furthermore, DS decreased biomass production, whereas increased the contents of superoxide radical (O2 •-) and hydrogen peroxide (H2O2), along with an enhanced accumulation of malondialdehyde (MDA) in the leaves of both cultivars. The above effects were greater in JD20 than those in ZD958. An increased ratio of NO3 - : NH4 + in culture solution increased the activities of SOD, POD and CAT while decreased the production of O2 •- and H2O2, thereby diminishing MDA accumulation, and increasing biomass production of drought-stressed plants of both cultivars. The above responses were pronounced in ZD958 than those in JD20. This study demonstrated that increased NO3 - -nutrition played a favored anti-oxidative metabolic role, as compared with NH4 + -nutrition, in the plants thereby increasing tolerance to DS.

2011-12-20T00:00:00Z CHUNFENG CHEN YOU CHEN QING ZHANG BENWEN CHEN CHENGWEI YANG WANG, YA QIN http://localhost:80/xmlui/handle/123456789/15536 2023-01-05T03:50:20Z 2011-12-20T00:00:00Z

Title: OVEREXPRESSION OF RICE PHYTOCHROME A IN ARABIDOPSIS: DIVERSE ROLE IN MULTIPLE PHYSIOLOGICAL RESPONSES Authors: CHUNFENG CHEN; YOU CHEN; QING ZHANG; BENWEN CHEN; CHENGWEI YANG; WANG, YA QIN Abstract: Phytochrome A predominantly mediates responses to prolonged far-red light such as the inhibition of hypocotyl elongation. It also acts in controlling responses to FR light pulses. To investigate to what extent rice phytochrome A complements the function of Arabidopsis phytochrome A, we examined hypocotyl elongation growth, seed germination, and greening in etiolated seedlings of phyA-211 mutant plants, WT and two kinds of transgenic plants in which WT and phyA211 mutants overexpressed rice PHYA cDNA. We found that ectopic expression of rice phytochrome A could partially rescue the sensitivity of phyA-211 mutant hypocotyls to prolonged far-red light and replace Arabidopsis phytochrome A in the promotion of seed germination and recovery of the ability to de-etiolate. Moreover, under end-of-day far-red light (EODFR), the exogenous rice phytochrome A was found to restore some aspects of growth in phyA-211 mutants, such as hypocotyl elongation, petiole elongation and flowering time. The diverse role of rice phytochrome A in the physiological responses of Arabidopsis implies the substitution of phytochrome signaling between monocots and dicots.

2011-12-20T00:00:00Z ANJUM PERVEEN MUHAMMAD QAISER http://localhost:80/xmlui/handle/123456789/15463 2022-12-27T05:54:42Z 2011-12-20T00:00:00Z

Title: POLLEN FLORA OF PAKISTAN –LXVIII. DIPSACACEAE Authors: ANJUM PERVEEN; MUHAMMAD QAISER Abstract: Pollen morphology of three genera representing 6 species of the family Dipsacaceae from Pakistan has been examined by light and scanning electron microscope. Pollen grains usually radially symmetrical, isopolar, mostly prolate-spheroidal rarely spheroidal, porate or tricolpate, sexine thicker or thinner than nexine. Tectal surface mostly spinulose rarely scabrate. On the basis of apertural types 3 distinct pollen types are recognized, viz.,Dipsacus inermis–type, Pterocephalus gedrosiacus–type and Scabiosa candollei–type.

2011-12-20T00:00:00Z HONGYU MA RUIFANG YANG ZHANKUI WANG TIAN YU YUYING JIA HANYAN GU XIANSHENG WANG HAO MA http://localhost:80/xmlui/handle/123456789/15433 2022-12-21T09:49:04Z 2011-12-20T00:00:00Z

Title: SCREENING OF SALINITY TOLERANT JUTE (CORCHORUS CAPSULARIS & C. OLITORIUS) GENOTYPES VIA PHENOTYPIC AND PHSIOLOGY-ASSISTED PROCEDURES Authors: HONGYU MA; RUIFANG YANG; ZHANKUI WANG; TIAN YU; YUYING JIA; HANYAN GU; XIANSHENG WANG; HAO MA Abstract: To obtain salt tolerant genotypes, salt tolerance of 10 jute genotypes of different origins was evaluated by relative salt harm rate at germination stage and by index of salt harm at seedling stage, respectively. The results indicated that salt tolerance of germination stage of jute was consistent with that of seedling stage, with a markedly significant (P < 0.01) correlation of 0.8432 (n =10). Two high salt tolerant genotypes (Huang No.1 and 9511) and two salt sensitive genotypes (Mengyuan and 07-21) were screened out by these methods. Further activity analysis of POD, SOD and CAT and determination of MDA content at seedling stage validated that genotypes Huang No.1 and 9511 were more salt tolerant than genotypes Mengyuan and 07-21. Our results indicated that the combination of relative salt harm rate at germination stage and index of salt harm at seedling stage can be used to evaluate salt tolerance of jute genotypes

2011-12-20T00:00:00Z