摘要
研究海藻功能物质海藻酸(AA)、褐藻多酚(AP)、甘露醇(AM)及甜菜碱(GB)对菜心抗旱胁迫的影响。结果发现:干旱胁迫处理明显降低菜心叶片相对含水量和叶绿素含量,超氧化物歧化酶(SOD)和过氧化物酶(POD)活性呈现先升高后降低的趋势;与正常条件相比,干旱胁迫使水溶肥处理的菜心生物量降低51.68%,而海藻肥处理的菜心生物量比水溶肥处理增加43%,可明显缓解干旱胁迫对菜心生长的抑制作用;干旱胁迫条件下,海藻肥中添加外源海藻酸、褐藻多酚、甘露醇和甜菜碱均能显著提高菜心叶片相对含水量和叶绿素含量,提高SOD和POD的活性,提高菜心生物量,并以1AA、4AP、4AM和50GB处理效果最佳。干旱胁迫下,海藻功能物质对菜心增产率大小顺序为1AA>4AP>4AM>50GB,海藻酸对菜心鲜质量增长的贡献率为24.65%,褐藻多酚为12.94%,甘露醇为11.80%,甜菜碱为11.20%。
4 types of functional substances including alginate acid(AA), alginate polyphenol(AP), mannitol(AM)and betaine(GB)are employed to investigate their effects on drought resistance of flowering cabbage. The results indicate that under drought stress, relative water content and chlorophyll content of flowering cabbage leaves are reduced markedly, and the activity of SOD and POD are increased first and then decreased. In comparison to the normal condition, the biomass of flowering cabbage treated by waterunder drought stress; Meanwhile, the biomass treated with seaweed fertilizer is 143% of that with water-soluble fertilizer. The addition of exogenous alginic acid, alginic polyphenol, mannitol and betaine in seaweed fertilizer could significantly increase the relative water content, the chlorophyll content, improve the activity of SOD and POD, and increase the biomass under drought stress. The optimal addition amount of AA, AP, AM and GB are 1-fold, 4-fold, 4-fold and 50-fold respectively. At the optimum concentration, the size of yield increasing rate under drought stress is 1 AA > 4 AP > 4 AM > 50 GB, the contribution rate of them to biomass is 24.65%, 12.94%, 11.80%,11.20% respectively.
引文
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