Morphophysiological Responses of Two Cool-Season Turfgrasses with Different Shade Tolerances
Morphophysiological Responses of Two Cool-Season Turfgrasses with Different Shade Tolerances
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DOI：
10.3390/agronomy12040959
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发表时间：
2022-04
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通讯作者：
Lili dong;Liangbing Xiong;Xiaoyang Sun;Saud Shah;Zhixin Guo;Xu-Yao Zhao;Lizhi Liu;Lintao Cheng-Lint
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作者：
Lili dong;Liangbing Xiong;Xiaoyang Sun;Saud Shah;Zhixin Guo;Xu-Yao Zhao;Lizhi Liu;Lintao Cheng-Lint
了解冷季型草坪草对遮荫反应的差异，对于今后草坪草的管理和提高耐荫性的育种具有重要意义。本研究的目的是从草坪性能、生长和生理特性方面评价两种冷季型草坪草的耐荫机理。两种草坪草，即‘Supranova’(POA.(Supina Schrad.)和‘百合’(Lolium perenne L.)分别接受0(对照，未遮荫)、35%(LS)、70%(MS)和92%(HS)的遮荫。与‘百合’相比，‘超级’在遮荫条件下表现出更好的草坪质量(TQ)和草坪色度(TCI)。‘百合’根系的总长度和表面积随着遮荫的增加而逐渐减小，而‘百合’的总长度和表面积则随着遮荫的增加先增大后减小。在HS胁迫下，叶绿素荧光光化学猝灭系数(QP)、电子传递速率(ETR)和初级光系统II(PSII)光化学最大量子效率(Fv/Fm)显著下降，但‘Lark’比‘Supranova’的下降幅度更大。两种草坪草在遮荫下的叶片反射率均低于对照，但在可见光波段‘百灵’的叶片反射率高于‘超级’。两种牧草的归一化差异植被指数(NDVI)呈先减小后增大的趋势。遮荫下‘百合’的NDVI略高于对照。‘超新星’对丙二醛、过氧化氢、超氧阴离子(O2·−)和抗坏血酸含量及超氧化物歧化酶、过氧化氢酶和过氧化氢酶活性表现出较强的耐性。在MS处理下，丙二醛、H_2O_2、O_2·−、AsA含量及代表指标的超氧化物歧化酶、过氧化物酶和过氧化氢酶活性变化最大，说明‘百合’比‘百合’对遮荫的适应性更强。
Understanding the differences in cool-season turfgrass responses to shade is critical for future turfgrass management and breeding for improved shade tolerance. The purpose of this study was to evaluate the shade-tolerance mechanisms of two cool-season turfgrass species in terms of turf performance, growth, and physiological characteristics. Two turfgrass species, namely, ’SupraNova’ (Poa. supina Schrad.) and ‘Lark’ (Lolium perenne L.), were subjected to 0 (CK, unshaded), 35% (LS), 70% (MS), and 92% (HS) shade, respectively. Compared with ‘Lark’, ‘SupraNova’ showed better turf quality (TQ) and turf color intensity (TCI) under shade. The total length and surface area of the roots of ‘Lark’ gradually decreased as the shade increased, while those of ‘SupraNova’ increased and then decreased with increasing shade. The chlorophyll fluorescence photochemical quenching coefficient (qP), electron transport rate (ETR), and maximum quantum yield of primary photosystem II (PSII) photochemistry (Fv/Fm) decreased significantly under HS; however, these decreases were more significant in ‘Lark’ than in ‘SupraNova’. The leaf reflectance of the two turfgrasses under shade was lower than that under CK, but the leaf reflectance of ‘Lark’ was higher than that of ‘SupraNova’ in the visible light band. The normalized difference vegetation index (NDVI) of the two grasses first decreased and then increased. The NDVI of ‘Lark’ under shade was slightly higher than that under CK. ‘SupraNova’ showed strong tolerance on the basis of malondialdehyde (MDA), hydrogen peroxide (H2O2), superoxide anion (O2·−), and ascorbic acid (AsA) contents and superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activity. The MDA, H2O2, O2·−, and AsA contents and SOD, POD, and CAT activity (which represent indicators) changed the most under MS. Taken together, the results indicated that the adaptability of ‘SupraNova’ to shade was better than that of ‘Lark’.