盐胁迫对南瓜幼苗生长及光合特性的影响

Effects of Salt Stress on the Growth and Photosynthetic Characteristics of Squash Seedlings

为研究南瓜对盐分胁迫的耐受性,采用水培法探讨不同浓度NaCl(0、50、100、150、200、250 mmol/L)对南瓜幼苗各生长指标及光合特性参数的影响。结果表明,随着NaCl浓度的增加,南瓜幼苗的植株高度、鲜重和干重均呈逐渐下降的趋势,叶绿素含量、气孔导度(Gs)、净光合速率(Pn)和蒸腾速率(Tr)均呈现先升高后降低的趋势,相对离子渗透率(RIP)呈先降低后升高的趋势。0~100 mmol/L NaCl对南瓜幼苗生长无显著影响,而高于100 mmol/L时,对其存活和光合作用有显著影响。南瓜具有较强的耐盐性。

To study the tolerance of squash to salt stress, hydroponics was adopted to investigate the effects of different concentrations of NaCl(0, 50, 100, 150, 200 and 250 mmol/L) on the growth and photosynthetic characteristics of squash seedlings. The results indicated that with the increase of NaCl concentration, the plant height, fresh weight and dry weight of squash seedlings gradually declined. The chlorophyll content, stomatal conductance(Gs), net photosynthetic rate(Pn) and transpiration rate(Tr) first increased and then decreased with the NaCl concentration increase. With the increase of NaCl concentration, the relative ionic permeability(RIP) showed a trend of first decrease and then increase. There was no significant effect on the growth of squash seedlings when NaCl concentration ranged from 0 to 100 mmol/L, but when NaCl concentration was higher than100 mmol/L, the survival rate and photosynthesis were significantly affected. The study demonstrates that squash has strong salt tolerance.