基质含水量和光照水平对网纹甜瓜幼苗生长和生理生化特性的影响

Effect of substrate moisture and illumination on growth,physiological and biochemical property of netted muskmelon seedling

以网纹甜瓜"西域一号"为试材,研究了基质含水量[基质最大持水量的100%(W1)、80%(W2)、60%(W3)和40%(W4)]和光照水平[温室内全光照的100%(L1)、70%(L2)、40%(L3)]交互作用对网纹甜瓜幼苗生长和生理生化特性的影响。结果表明:不同基质含水量和光照强度对网纹甜瓜幼苗生长影响显著,以80%基质含水量结合温室内100%光照的幼苗生长最健壮。光照强度对植株可溶性糖含量影响显著,而基质含水量只有在全光照下才表现出显著影响。在3个光照强度下,可溶性蛋白及游离脯氨酸含量随基质含水量的减少显著增加;而在基质含水量相同的情况下,光照强度的影响较小。在所有处理中,W2L1处理的SOD和POD活性最低,CAT活性较低。MDA含量以W2L1处理最低,W4L3处理最高。

In an environment with different substrate moistures [100% （W 1）,80% （W 2）,60% （W 3） and 40% （W 4） of moisture capacity of substrate] and illumination levels [100% （L 1）,70% （L 2）,40% （L 3） of natural light intensity] interaction,the growth,physiological and biochemical properties of muskmelon seedling were investigated using netted muskmelon ＂Xiyuyihao＂ as material.Results show that seedling growth is significantly influenced by substrate moisture and light intensity,with 80% substrate moisture and 100% light intensity presenting the strongest growth vigor in greenhouse.Light intensity has a significant effect on soluble sugar content.Only under 100% light intensity does substrate moisture significantly influence soluble sugar content.Under three different illumination levels,soluble protein and free proline contents obviously increase with reduced substrate moisture.When the substrate moisture is the same,the effect of light intensity is relatively less.In all the treatments,W 2 L 1 exhibits the lowest SOD and POD activity,and simultaneously showing a low CAT activity.While W 2 L 1 has the minimum,W 4 L 3 has the maximum MDA content.