Comparative Study on Drought Resistance of Seedling and Cutting of Jatropha curcas
Abstract: In recent years, Yunnan had suffered from the worst drought in a century, and there was the big-gest challenge in front of the development of forestry industry, whereupon it would be particularly important for us to cultivate improved drought-resistant species and research its drought resistance mechanism. Therefore the drought resistance of two different modes of reproduction (seedlings and cuttings) of Jatropha curcas was researched from the growth indexes, physiological and biochemical indexes with the moisture gradient method to control water. And then the comprehensive evaluation and comparison of their drought resistance ability was made by use of variance analysis, correlation analysis and application method of subordinate function in SPSS software. The results showed that : 1) under the different degree of drought stress, the survival rate of those two different modes of reproduction seedlings were both up to 100%, and most of leaves didn’t appear wilting, leaf curl, fallen leaves at the middle, late and last phase until under the severe drought stress; 2) the growth in seedling height was restrained with the increase of drought stress degree and the extension of time; 3) the total dry weight of the plant, stem, leaves and root were all in downtrend, compared to check samples, the decline range of above indexes of cuttings of Jatropha curcas was lower than its seedlings; 4) compared to check samples, the root shoot ratio of those two different seedlings took on apparent uptrend along with the increase of drought stress degree and extension of time; 5) the relative water content of seedling leaves declined, and the decline range was in proportion to the degree of drought stress and the length of time. And those two modes of reproduction differed in the decline range. It can be seen that Jatropha curcas seedling in whatever kind of reproduction still could maintain its normal physiological process, maintain relatively high growth rate and drought resistance ability. According to the drought coefficient and the relative growth in seedling height, the drought-resistant growth of cuttings was a little higher than that of seedlings.
文章引用: 李甜江 , 温绍龙 , 郎南军 (2015) 膏桐实生苗与扦插苗的抗旱性对比研究。 林业世界， 4， 76-84. doi: 10.12677/WJF.2015.44013
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