不同梯度光照强度对黄瓜嫁接苗愈合及幼苗质量影响

为探究黄瓜嫁接苗愈合及幼苗生长的最佳光照模式,本研究选择南瓜‘壮士’品种为砧木,黄瓜‘大棚冬青’品种为接穗,顶插嫁接后0~3、4~6、7~10 d为阶段性递增光照模式,以(0-30-45) μmol/(m²·s)为对照（CK）,设(15-30-45)、(30-60-90)、(45-90-135)、(60-120-180)、(75-150-225) μmol/(m²·s)]分别为T1、T2、T3、T4和T5处理,研究不同梯度光照强度对黄瓜嫁接苗愈合生长及幼苗质量的影响。结果表明,与CK相比,嫁接后0~3 d适宜光照优于黑暗条件,光照强度梯度在处理T2~T5之间时,能显著提高接合部愈合效果（P<0.05）;其中T3处理最有利于黄瓜嫁接苗愈合及生长,其地上部、地下部形态生长指标最佳,最有利于促进黄瓜嫁接苗雌花分化和早熟;T3与T4处理幼苗真叶生长势较优,而T2与T3处理有利于嫁接苗光合色素含量的增加;运用隶属函数值法进行综合分析,各处理下隶属函数综合评价值大小排名为：T3>T2>T4>T5>T1>CK。综合分析得出,T3处理即嫁接后0~3、4~6、7~10 d的光强梯度为(45-90-135) μmol/(m²·s),最有利于黄瓜嫁接苗的愈合生长及幼苗质量的提高,故T3梯度光照强度可作为黄瓜嫁接苗愈合期处理的最适光强模式。

Effects of Different Gradient Light Intensity on Healing Growing and Quality of Grafted Cucumber Seedlings

In order to explore the best light pattern of cucumber grafted seedling healing and seedling growth, the pumpkin cultivar ‘Zhuangshi’ was used as the rootstock and cucumber cultivar ‘Dapengdongqing’ as the scion. A stepwise incremental illumination mode was used for the seedling 0-3, 4-6, 7-10 d after top grafted. The light intensity was T1 (15-30-45) μmol/(m²·s), T2 (30-60-90) μmol/(m²·s), T3 (45-90-135) μmol/(m²·s), T4 (60-120-180) μmol/(m²·s) and T5 (75-150-225) μmol/(m²·s), CK (0-30-45) μmol/(m²·s). Compared with CK, the suitable light was better than the dark condition at 0-3 d after grafted. The light intensity gradient significantly improved the joint healing effect when treated between T2-T5 (P<0.05). It is beneficial to the healing and growth of the grafted seedlings. The growth index of above-ground and under-ground parts was the best, which was best beneficial to promoting the differentiation and early maturity of grafted seedlings. The T3 and T4 treated seedlings had better growth potential, while the T2 and T3 treated was beneficial to the increase of photosynthetic pigment content in the grafted. The ranking of the comprehensive evaluation value of membership function under each treatment was: T3 > T2 > T4 > T5 > T1 > CK. According to the comprehensive analysis, the light intensity gradient of T3 treatment in 0-3, 4-6 and 7-10 d after grafted was (45-90-135) μmol/(m²·s), which was best beneficial to the healing growth of the grafted.