NaCl对不同甜瓜品种植株中K^+和Na^+含量的影响

K^+ and Na^+ Contents in Plants of Muskmelon Varieties under NaCl Stress

用75、150、225和300 mmol/L的NaCl对耐盐性不同的4个甜瓜品种——耐盐品种:"海蜜四号(网纹)"、"冰雪脆(光皮)",敏感品种:"玉露(网纹)"、"秀绿(光皮)"进行处理,研究不同甜瓜品种根、茎、叶和果实中的K+和Na+含量的变化。结果表明:随着NaCl浓度升高,甜瓜耐盐品种根、茎、叶和果实中Na+含量均低于盐敏感品种,而根中K+含量降低幅度显著小于盐敏感品种;耐盐品种茎、叶和果实中Na+/K+比值显著低于盐敏感品种,而根中无显著变化。从植株干重中可知,耐盐品种在任何浓度下都无显著变化,而盐敏感品种都下降。耐盐品种"冰雪脆"的单果鲜重和干重下降幅度最小,盐敏感品种"秀绿"下降幅度最大。

The absorbability and distributions of Na＋,K＋ in different organs of four muskmelon varieties,salty tolerance varieties（Haimisihao、Bingxuecui） and salty sensitive varieties（Yulu、Xiulv）,were investigated under NaCl stress（75,150,225,300 mmol/L） in artificially controlled conditions.The results indicated that the Na＋content in the root,stalk,leave and fruit of the tolerant muskmelon was significantly lower than those of salt sensitive muskmelon with the increase of the NaCl concentraion.However,the K＋ content in salt tolerant muskmelon root was significantly lower than that in the salt sensitive muskmelon root.Na＋/K＋ values in the stalk,leave and fruit of salty tolerant muskmelon was significantly lower than that in sensitive muskmelon though no significant difference of Na＋/K＋ was found in the root of salty tolerant and salt sensitive muskmelon.No significant difference was indicated in the amount of dry matter including root,shoot,leaves and fruits of all salty tolerant muskmelon.The minimum decreased weight of single fresh fruit and dry matter was detected in the salty tolerant muskmelon ＂Bingxuecui＂ while the maximum decreased weight of single fresh fruit and dry matter was found in the sensitive tolerant muskmelon ＂Xiulv＂.