遮荫对不同种源菠萝蜜幼苗雨季与旱季生长及生理生化特性的影响

为研究光照强度对不同种源菠萝蜜幼苗生理特性的影响,以泰国菠萝蜜(B1)、马来西亚菠萝蜜(B2)、四季菠萝蜜(B3)幼苗为研究对象,设置4种光照强度,自然光(CK),75%的自然光(T1),50%的自然光(T2),25%的自然光(T3).结果表明:菠萝幼苗生理特性响应变化是不同种源和光照强度共同作用的结果:1)不同种源菠萝蜜的相对生长速率均随光照强度的减弱而减弱,光强太弱虽然株高增加明显但是茎基过细,四季菠萝蜜相对生长速率高于泰国和马来西亚菠萝蜜;2)整体来看,不同光照强度和不同种源间生理生化值差异有统计学意义,随着光强减弱菠萝蜜叶绿素(Chl)和丙二醛(MDA)质量分数增加,可溶性糖(SS)、蔗糖(SUC)、可溶性蛋白质(SP)质量分数减少;3)采用主成分分析法筛选出7个与菠萝蜜幼苗遮荫密切相关的生理生化指标,即SS,SP,SUC,MDA,Chla,Chlb和Chl质量分数.

Effects of Shading on the Growth and Physiological and Biochemical Characteristics of Artocarpus heterophyllus with Different Origins in Dry and Rainy Seasons

Seedlings of 3 genotypes of jackfruit (Artocarpus heterophyllus) with different origins, i.e. Thailand jackfruit, Malaysian jackfruit and four-season jackfruit, were grown under the conditions of nature light (CK), 75% nature light (T1), 50% nature light (T2), 25% nature light (T3) to study the effects of light intensity on their physiological characteristics. The results showed that the response to physiological change were the combined effects of genotype and light intensity:The relative growth speed of all the jackfruit genotypes decreased with decreasing light intensity. Weak light resulted in greater plant height, but very thin stem base. The relative growth speed of four-season jackfruit was higher than that of Thailand jackfruit and Malaysian jackfruit. There were significant differences in physiological and biochemical characteristics among different genotypes and light intensity treatments. With decreasing light intensity, Chl and MDA contents increased, and SS, SUC and SP contents decreased. Based on the results of principal component analysis, SS, SP, SUC, MDA, Chla, Chlb and Chl were identified as physiological and biochemical indicators closely associated with jackfruit seedling shading.