论文部分内容阅读
采用营养液栽培,进行NaCl盐胁迫处理,以耐盐性较强的葫芦为砧木嫁接西瓜,研究嫁接对盐胁迫下嫁接苗根部和地上部、根组织各部位Na+和K+含量的影响。结果表明,嫁接苗地下部比地上部截留了较多的Na+,而地上部的K+含量明显高于地下部;嫁接苗对Na+的根部截流和K+的地上部吸收能力强于自根苗。说明西瓜嫁接苗可阻隔根系内皮层对Na+向中柱导管中的运输以及限制Na+向中柱导管中的装载,进而将Na+较多地截流在根部,阻止其向地上部分运输;同时将K+较多地运输到地上部分,使地上部保持较高的[K+]/[Na+]比值,从而保持西瓜嫁接苗较强的耐盐性。
The nutrient solution was used for cultivation and NaCl stress treatment was carried out. The watermelon was harvested from the gourd with high salt tolerance, and the effects of grafting on the content of Na + and K + in the roots, shoots and roots of the grafted seedlings under salt stress were studied. The results showed that the grafted seedlings retained more Na + in the ground than in the shoots, while the K + contents in the shoots were significantly higher than those in the ground parts. The grafted seedlings had stronger root anastomosis and K + uptake than the self-rooted seedlings. The results showed that watermelon grafted seedlings could block the transport of Na + to the central column and restrict the loading of Na + to the central column, and then intercept the Na + more in the root to prevent its transport to the aboveground part. At the same time, Multi-transport to the aboveground parts, so that the upper part of the higher [K +] / [Na +] ratio, so as to maintain watermelon grafted seedlings strong salt tolerance.