Physiological response of three micropropagated plantlets of Rhododendron hybrids for heat stress

文献类型： 外文期刊

第一作者： Oba, Elias G.

作者： Oba, Elias G.;Li, Shifeng;Peng, Lvchun;Wang, Jihua;Xie, Weijia;Oba, Elias G.;Hu, Jingfeng;Zhang, Zhihui

作者机构：

关键词： antioxidants; chlorophyll fluorescence; fluorescence imaging; photosynthesis; photosystem II (PSII) photochemistry; screening

期刊名称：EUROPEAN JOURNAL OF HORTICULTURAL SCIENCE （ 影响因子：1.482； 五年影响因子：1.503 ）

ISSN： 1611-4426

年卷期： 2021 年 86 卷 3 期

页码：

收录情况： SCI

摘要： As a result of global warming, heat stress has become the major challenge to plant growth and development. To avert this challenge, development of heat stress tolerant cultivars is the major way forward. Here we evaluated the response of three Rhododendron hybrids (R. 'XXL' x R. 'Jingle Bells', R. 'XXL' x R. 'Cosmopolitan', and IL 'XXL') to heat stress under control conditions. Rhododendron in vitro plantlets were placed in a growth chamber at 38 degrees C for 18 days and the plantlets were monitored at 0, 3, 6, 12 and 18 day for chlorophyll fluorescence parameters (Fv/Fm and F'v/F'm), SOD activity and proline content. As heat stress duration prolonged, chlorophyll fluorescence parameters (Fv/Fm and F'v/F'm) gradually decreased. However, F'v/F'm better differentiated hybrids for heat stress response than Fv/Fm. R. 'XXL' x R. 'Jingle Bells' showed significantly lower Fv/Fm than other hybrids only at 12th day. On the other hand, IL 'XXL. showed significantly higher F'v/F'm among hybrids. In addition, significantly higher SOD activity and proline accumulation observed at 12th day and 6th day of heat stress treatment for R. 'XXL', respectively. Our work also showed the first attempt of using chlorophyll fluorescence imaging system to study heat stress response of in vitro raised Rhododendron. This study provides useful information for gene banks to screen large Rhododendron germplasm collections for heat stress tolerance.

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