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以较耐盐黄瓜品种新泰密刺为试材,采用营养液栽培,研究了叶面喷施Ca(NO3)2对盐胁迫(65 mmol/L NaCl)下黄瓜幼苗生长、叶片叶绿素含量、光合及叶绿素荧光参数的影响。结果表明,外源Ca(NO3)2显著提高了盐胁迫下黄瓜幼苗的干鲜重和叶片叶绿素含量;Ca(NO3)2也提高了盐胁迫下黄瓜叶片净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、PSⅡ实际光化学效率(ФPSⅡ)、光条件下最大光化学效率(F’v/F’m)和光化学淬灭系数(qP),而对胞间CO2浓度(Ci)、暗条件下最大化学效率(Fv/Fm)和非光化学淬灭系数(qN)没有显著影响。这些结果说明外源Ca(NO3)2可能通过提高叶绿素含量和调节气孔限制,以缓解盐胁迫对黄瓜幼苗光化学效率的抑制,进而提高植株耐盐胁迫能力,促进其生长。
The experiment was conducted to study the effects of foliar application of Ca (NO3) 2 on the growth of cucumber seedlings under salt stress (65 mmol / L NaCl), chlorophyll content, photosynthesis And chlorophyll fluorescence parameters. The results showed that exogenous Ca (NO3) 2 significantly increased the dry and fresh weight and chlorophyll content of cucumber seedlings under salt stress. Ca (NO3) 2 also increased the net photosynthetic rate (Pn) and stomatal conductance (Gs), transpiration rate (Tr), PSⅡ actual photochemical efficiency (ФPSⅡ), maximum photochemical efficiency (F’v / F’m) and photochemical quenching coefficient (qP) ), The maximum chemical efficiency (Fv / Fm) and the non-photochemical quenching coefficient (qN) under dark conditions had no significant effect. These results suggest that exogenous Ca (NO3) 2 may alleviate the inhibition of photochemical efficiency of cucumber seedlings by increasing chlorophyll content and regulating stomatal limitation, thereby increasing salt tolerance and promoting the growth of cucumber seedlings.