衣藻和固氮鱼腥藻对盐胁迫下小麦幼苗生长的影响

以小麦为试验材料,研究了向土壤中添加衣藻(Chlamydomonas debaryana Gor.)、固氮鱼腥藻(Anabaena azotica Ley.)或其混合藻液对盐胁迫下小麦幼苗生长的影响。结果表明:50 mmol·L^-1 NaCl可以促进小麦茎长和根长的生长,但在100、200 mmol·L^-1 NaCl处理下,小麦生长受到抑制,茎长、根长、鲜质量、叶绿素含量和光系统Ⅱ最大光化学效率(F_v/F_m)值下降。添加微藻藻液可以缓解盐胁迫对小麦生长的抑制作用,提高盐胁迫下小麦的茎长、根长、鲜质量、叶绿素含量和光合作用效率,增强其抗氧化酶——超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)的活性来清除活性氧,从而提高小麦的耐盐性。

Effects of Chlamydomonas debaryana Gor. and Anabaena azotica Ley. on wheat seedling growth under salt stress

In the present study, wheat seedlings were used as the experimental material, to explore the effects of microalgae (Chlamydomonas debaryana Gor., Anabaena azotica Ley., and their mixture) on the growth of wheat seedlings under salt stress. It was shown that 50 mmol·L^-1 NaCl could promote the growth of wheat stem and root. Under 100, 200 mmol·L^-1 NaCl, the growth of wheat was inhibited, as the stem length, root length, fresh weight, chlorophyll content and the value of maximal photochemistry efficiency of PSⅡ(F_v/F_m) decreased. The addition of microalgae could alleviate the inhibition of salt stress on wheat growth, by increasing the stem length, root length, fresh weight, chlorophyll content and photosynthesis efficiency of wheat, and enhance the activity of antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) to remove active oxygen, so as to improve the salt tolerance of wheat.