蜜柚不同砧穗组合苗期嫁接亲和性评价

Graft Compatibility Evaluation of Different Rootstock-scion Combinations of Honey Pomelo at Seedling Stage

摘要:

为评价蜜柚砧穗的嫁接亲和性,以红绵蜜柚(Citrus grandis ‘Hongmianmiyou’)、三红蜜柚(‘Sanhongmiyou’)、红肉蜜柚(‘Hongroumiyou’)、黄金蜜柚(‘Huangjinmiyou’)和琯溪蜜柚(‘Guanximiyou’)作接穗,枳(Poncirus trifoliata)、香橙(Citrus junos)、酸柚(Citrus grandis)作砧木,田间调查15个砧穗组合苗期生长指标,测定嫁接愈合期叶片多酚氧化酶(PPO)和过氧化物酶(POD)活性、可溶性蛋白和可溶性糖含量,采用主成分分析和聚类分析方法对蜜柚砧穗组合嫁接亲和性进行评价。结果表明,以柚作砧木的砧穗组合保存率高、生长势旺盛、抽梢能力强,以枳和香橙作砧木的砧穗组合部分指标存在差异,其中红绵蜜柚和黄金蜜柚以枳作砧木时表现出不亲和现象。不同砧穗组合嫁接愈合时期PPO、POD、可溶性蛋白和可溶性糖变化趋势基本一致。主成分分析结果表明,4个主成分基本反映了15个指标91.33%的数据信息。聚类分析将15个砧穗组合分为4类,与主成分分析结果基本一致。因此,琯溪蜜柚、红肉蜜柚和三红蜜柚嫁接可采用枳和柚作砧木,红绵蜜柚和黄金蜜柚嫁接可采用柚作砧木,红绵蜜柚和黄金蜜柚嫁接不可采用枳作砧木。

Abstract:

In order to evaluate graft compatibility of different honey pomelo (Citrus grandis) rootstock-scion combinations at seedling stage, five cultivars of honey pomelo, such as ‘Hongmianmiyou’, ‘Sanhongmiyou’, ‘Hongroumiyou’, ‘Huangjinmiyou’ and ‘Guanximiyou’ were used as scions, and Citrus grandis, C. junos, Poncirus trifoliate as rootstocks, some physiological and biochemical indexes of 15 rootstock-scion combinations at seedling stage were determined. Their graft compatibility was evaluated by using principal component and cluster analysis. The results showed that there were significant differences in seedling growth among different rootstock-scion combinations, which ‘Hongmianmiyou’/Poncirus trifoliata and ‘Huangjinmiyou’/Poncirus trifoliata combinations were imcompatibility. The changes in PPO, POD activities, soluble protein, soluble sugar contents were similar at graft union stage in different rootstock-scion combinations. Four principal components could present 91.33% information of 15 indexes, and the cluster analysis showed that 15 rootstock-scion combinations could be divided into 4 clusters. Therefore, it was suggested that ‘Guanximiyou’, ‘Hongroumiyou’, ‘Sanhongmiyou’ could graft with Citrus grandis and Poncirus trifoliata, ‘Hongmianmiyou’ and ‘Huangjinmiyou’ with Citrus grandis, ‘Hongmianmiyou’ and ‘Huangjinmiyou’ could not graft with Poncirus trifoliata.