干旱胁迫对辣椒果实中辣椒素、二氢辣椒素及VC含量的影响

以湘研5号辣椒为试材,采用盆栽控水试验,设置轻度干旱、中度干旱和正常灌水(对照)3个水分梯度,研究干旱胁迫对辣椒果实中辣椒素、二氢辣椒素和VC含量的影响,同时研究了干旱胁迫后植株叶片光合特性的变化。结果表明:在开花后60d,轻度干旱处理能显著提高辣椒果实中辣椒素和二氢辣椒素的含量,分别比对照提高63.36%和63.03%。在开花后40d和50d,不同程度的干旱胁迫均能显著提高辣椒果实中的VC含量。在开花后60d,轻度干旱处理使辣椒果实中的VC含量达到最高,而中度干旱胁迫下辣椒果实中的VC含量显著低于对照。不同程度的干旱胁迫处理后,辣椒植株的净光合速率均呈现先上升后下降的趋势,并且随着干旱程度的增加而逐渐降低。

Effect of Drought Stress on Capsaicin Contents， Dihydrocapsaicin and Vitamin C in Pepper（Capsicum frutescens L.）Fruit

Taking pepper（Capsicum frutescens L.）‘Xiangyan No.5’ as material， this experiment applied water controlled pot cultivation under 2 different drought stresses（ mild， and moderate） conditions， and studied the effect of drought stress on pepper contents of capsaicin， dihydrocapsaicin and vitamin C， and the changes in leaf blade photosynthetic characters. The result showed that the contents of capsaicin and dihydrocapsaicin were increased 63.36% and 63.03%， respectively than the control under mild drought stress 60 days after flowering. It also showed that 40 days and 50 days after flowering， different degrees of drought stress could remarkably improve the contents of vitamin C in pepper. Sixty days after flowering， mild drought treatment could push the vitamin C content to the highest level， while the moderate drought stress could make the vitamin C content lower than that of the contrast. After the treatment of different degree drought stress， the net photosynthetic rate of pepper plant shew the tendency of firstly increase then decline， and gradually decreased along with the enhancement of drought degree.