Fine fescues, taxa within the Festuca genus, are considered some of the most shade‐tolerant cool‐season turfgrasses, but past research from field studies has been inconsistent. The objective of this research was to evaluate variation in Chewings fescue (Festuca rubra L. ssp. commutata Gaudin, CH), hard fescue (F. brevipila Tracey, HD), and strong creeping red fescue (F. rubra ssp. rubra Gaudin, ST) morphology and physiology under simulated foliar shade and full sun. Experiments were carried out using 12 CH, 13 HD, and 15 ST entries within a greenhouse with or without a photoselective filter to simulate foliar shade. The filter reduced the red to far‐red (R/FR) ratio to ∼0.66, and light intensity was reduced to 30% of full sun under shade treatment. Several parameters were assessed including height, the number of tillers, biomass, total chlorophyll, and the chlorophyll a/b ratio. In both sun and shade experiments, ST were significantly taller than the other taxa. Chewings fescue and HD had significantly more tillers than ST in sun, but both CH and ST had significantly more tillers than HD in shade. Hard fescue had the greatest biomass in sun, and the least in shade. Significantly more CH genotypes lacked shade avoidance responses (SAR) than both other taxa under shade, and a greater proportion of HD were shade intolerant. Based on this study, CH > ST > HD in terms of improved response to shade. However, variation for response to shade observed within entries indicates potential for future improvement.

中文翻译：

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细羊茅分类单元对模拟叶面阴影的变化

Festuca属中的优良羊茅类群被认为是最耐阴凉季节的草皮草，但以往田间研究的结果一直不一致。这项研究的目的是评估在Chewings羊茅变化（羊茅属亚种commutata戈丹，CH），硬羊茅（F. brevipila特蕾西，HD），以及强匍匐紫羊茅（紫羊茅亚种杨梅模拟叶面阴影和全日照下的Gaudin，ST）形态和生理。在有或没有光选择性滤光器的温室中使用12 CH，13 HD和15 ST条目进行实验，以模拟叶面阴影。滤光片将红与远红（R / FR）的比例降低至〜0.66，并且在遮光处理下，光强度降低至全日照的30％。评估了几个参数，包括高度，分till数，生物量，总叶绿素和叶绿素a / b比。在阳光和阴影实验中，ST均明显高于其他类群。在阳光下，咀嚼的羊茅和高分till比ST的分till多得多，但是在阴影下，CH和ST的分till比HD的分significantly多得多。硬羊茅在阳光下的生物量最大，在阴影下的生物量最少。与处于阴影下的其他两个类群相比，有更多的CH基因型缺乏避荫反应（SAR），并且更大比例的HD不耐荫。根据这项研究，在改善对阴影的响应方面，CH> ST> HD。但是，条目中观察到的对阴影的响应变化表明将来有改进的潜力。