Mg对‘黑美人’西瓜叶片C、N代谢的影响  

Effect of magnesium on carbon and nitrogen metabolism of ‘Heimeiren' watermelon leaves

作　　者：林丽琳[1] 陈晟[2] 施木田[1] 吴宇芬[2] 赵依杰 王俊芳[1] 周庆云[1] 彭密红 

机构地区：[1]福建农林大学园艺学院,福建福州350002 [2]福建省农业科学院农业生物资源研究所,福建福州350003 [3]福州市农业科学研究所,福建福州350019

出　　处：《亚热带农业研究》2015年第1期25-30,共6页Subtropical Agriculture Research

基　　金：农业部公益性行业专项(200903049-08)

摘　　要：通过砂培试验研究了0(CK)、24、48、96、192 mg·L-1Mg2+对‘黑美人’西瓜生育期叶片C、N代谢的影响。结果表明,Mg2+影响西瓜的整个生长发育过程,且随着浓度的提高,西瓜叶片叶绿素、类胡萝卜素、可溶性糖、可溶性蛋白含量和硝酸还原酶活性呈先升高后降低趋势,48 mg·L-1Mg2+处理下各指标达到同期的最大值。该处理下西瓜叶片叶绿素、类胡萝卜素、可溶性糖、可溶性蛋白含量和硝酸还原酶活性均为:伸蔓期>盛花期>膨瓜期,表明西瓜生长的适合Mg2+浓度为48mg·L-1。膨瓜期是西瓜缺Mg的敏感期,该期适当增施Mg肥可以减轻缺Mg对西瓜叶片C、N代谢的影响。The watermelon ＇ Heimeiren＇ grown in pots containing sand were treated to investigate the effects of magnesium concen- trations of 0, 24, 48, 96, 192 nag ·L -1on carbon and nitrogen metabolism of watermelon leaves. The results showed that magnesi- um concentration affected the entire growth process of watermelon. In each period, the effect of magnesium on contents of chloro- phyll, carotenoids, soluble sugar, soluble protein and nitrate reductase activity of ＇ Heimeiren ＇ watermelon presented to increase to a maximum followed by decreasing. The content of each substance and nitrate reductase activity reached to a maximum for the same period when magnesium concentration was 48 mg ~ L - x. Under 48 mg~ L - 1 magnesium concentration, contents of chlorophyll, ca- rotenoids, soluble sugar, soluble protein and nitrate reductase activity of ＇ Heimeiren＇ watermelon were vine stretching period 〉 flowering period 〉 expansion period. So, the suitable magnesium concentration was 48 rng · L-1. Watermelon was sensitive to mag- nesium deficiency when it was expanding, adding magnesium fertilizer at the appropriate period could mitigate the effects of magnesi- um deficiency on carbon and nitrogen metabolism of watermelon leaves.

关 键 词：Mg水平 西瓜 叶片 C、N代谢 

分 类 号：S651[农业科学—果树学]