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Response to droughty stresses and drought-resistances evaluation of four species during seed germination



Response to droughty stresses and drought-resistances evaluation of four species during seed germination



Xibei Zhiwu Xuebao 26(9): 1811-1818



The total seed germination rates, seedling fresh weights and vigor indexes of four species, Elaeagnus angusti folia L. ,Caragana korshinskii Kom. ,Periploca sepium Bge and Fraxinus velutina Torr, were studied under droughty circumstances simulated with 1/2 Hoagland solution having different concentrations of PEG-6000. It was shown that (1) as the drought become intensified the total seed germination rates,seedling fresh weights and vigor indexes of four species tended to decline and those of F. velutina Torr presented the largest decrement, but the drought-resistance indexes of E. angusti folia L. ,C. korshinskii Kom. P. sepium Bge were significantly higher than that of F. velutina Torr; (2) the diurnal germination rates and radicel variations of the four species indicated that PEG-6000 exerted good inductive effect on the seed germinations of C. korshinskii Kom. ,P.sepium Bge at low concentration, the seeds of F. velutina Torr and P. sepium Bge germinated in a concentrative manner and the seeds of E. angustifolia L. C. korshinskii Kom. Germinated in a dispersed manner; the radicels of E. angusti folia L., C. korshinskii Kom. and F. velutina Torr appeared to grow linearly and the radicels of P. sepium Bge appeared to grow exponentially; (3) the comprehensive evaluation of the relative seed germination rates, relative seedling fresh weights and relative vigor indexes of four species by membership function method indicated that the drought resistances of the four species decreased in the order of C. korshinskii Kom. > E. angust folia L. > P. sepium Bge > F. velutina Torr.

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