Na_2CO_3胁迫对蚕豆幼苗生长及叶绿素含量的影响

Effects of Na_2CO_3 Stress on Growth and Chlorophyll Content of Vicia faba L.

研究不同浓度(5,10,15,25mmol/L)Na2CO3胁迫对蚕豆幼苗生长及叶绿素含量等指标的影响及作用机理。结果表明,低浓度的Na2CO3处理促进了蚕豆幼苗鲜、干质量增加,Na2CO3浓度超过25mmol/L时将抑制蚕豆幼苗生长。随Na2CO3浓度的升高,蚕豆幼苗叶绿素a、叶绿素b、叶绿素a+b的含量先升高后降低。25mmol/LNa2CO3较严重地抑制了叶绿素的合成。随着Na2CO3浓度的升高,叶绿素a/b先升高后下降,最高点出现在5mmol/LNa2CO3处理时,15mmol/LNa2CO3处理叶绿素a/b与对照无明显差别,25mmol/LNa2CO3处理叶绿素a/b比对照有所下降。

Four groups of young seedlings of Vicia faba L.were treated with 5,10,15 and 25 mmol/L Na2CO3 for 6 days,respectively.The fresh weight and dry weight,chlorophyll content and other physiological indices were measured.The main results showed that low concentration of Na2CO3 promotes the fresh weight and dry weight of Vicia faba L.,and high concentration of Na2CO3（25 mmol/L） inhibits its growth.Content of chlorophyll a,b,and a＋b increased with the increase of Na2CO3 concentration.And then decreased under the treatment with 25 mmol/L Na2CO3.Chlorophyll a/b increased significantly,it reached the peak value at 15 mmol/L Na2CO3 concent and then decreased at 25 mmol/L Na2CO3 concent.