特定黄瓜品种果实发育过程中品质变化

目的]研究中农19号和中农29号这2个品种的最佳采收期.方法]选取中农19号、中农29号两个黄瓜品种,研究其在果实发育期间果实的纵、横径及可溶性蛋白、可溶性糖、维生素C含量变化,以此为依据确定这两个品种的最佳采收期.结果]中农19号、中农29号第5～10 d生长速度最快,果实纵、横径随时间增加逐渐变长变粗;瓜果内的蛋白质及维生素C含量变化为:中农19号在第8d达到最高,随后又下降并趋于稳定;中农29号则是在第8d达到最高,后先下降又升高.中农19号可溶性糖含量先升高后下降再升高,而中农20号则出现2次高峰.结论]综合考虑生理指标和形态指标,确定中农19号、中农29号均是在开花后8d为最佳的鲜食果实采收期.

Quality Change in the Course of Fruit Development of Specific Cucumber Cultivars

Objective] To study optimal harvest period of Zhongnong No.19 and Zhongnong No.29.Method] The optimal harvest periods of the two cucumber cultivars,Zhongnong No.19 and Zhongnong No.29,were investigated through analyzing the changes of fruit appearance (vertical diameter,transverse diameter) and quality (contents of soluble protein,soluble saccharide,and vitamin C) in the entire course of fruit growth.Result] Zhongnong No.19 and Zhongnong No.29 grew at the fastest rate during the 5-10 d of life.The longitudinal and transverse diameter increased with time.The protein and vitamin C content of cucumber was:Zhongnong No.19 reached the highest in 8d,then decreased and became stable,while Zhongnong No.29 reached the highest in 8d,then decreased and increased again.Soluble saccharide content of Zhongnong No.19 first rose then fell and rose again;Zhongnong No.29 had two peaks.Conclusion] Based on the physiological and morphological index,the eighth day after blooming was the optimal harvest day for Zhongnong No.19 and Zhongnong No.29 fresh fruits.