Guizhou Botanical Garden, Guiyang, Guizhou, China.
Grassland Resources and Ecology Research Center, Beijing Forestry University, Beijing, China.
PLoS One. 2018 Oct 8;13(10):e0204983. doi: 10.1371/journal.pone.0204983. eCollection 2018.
Turfgrasses have been widely utilized by humans to enhance the environment for more than several centuries. Seed germination is of great importance in the development of the turfgrass industry. In this study, the seed germination models of the responses of three types of turfgrasses to water were studied. The results indicated that irrigation water was mainly related to the variation of seed volume rather than a fixed value in this experiment. The maximum k value of tall fescue, Kentucky bluegrass and perennial ryegrass is 1.1548, 1.6946 and 4.0940, respectively. The optimal value of k is 1.0617 for tall fescue, 1.4610 for Kentucky bluegrass, and 1.6614 for perennial ryegrass. Perennial ryegrass seeds are more sensitive to water than those of tall fescue and Kentucky bluegrass, and this turfgrass is the fastest to reach the maximum value of the germination rate. Based on the results from the present experiment, the seed germination function can describe the response of turfgrass seed germination to external water content variation and their sensitivities. The function obtained could be used to perform quantitative studies on the dynamic changes of seed germination under different water conditions that will contribute to improved predictions of the optimal fitting curves of the germination over a range of water.
草坪草在改善环境方面被人类广泛应用已有数百年的历史。种子萌发对于草坪业的发展非常重要。本研究探讨了三种草坪草对水分响应的种子萌发模型。结果表明，在本实验中灌溉水主要与种子体积的变化有关，而不是一个固定值。高羊茅、肯塔基蓝草和多年生黑麦草的最大 k 值分别为 1.1548、1.6946 和 4.0940。高羊茅的最佳 k 值为 1.0617，肯塔基蓝草为 1.4610，多年生黑麦草为 1.6614。多年生黑麦草种子对水的敏感性高于高羊茅和肯塔基蓝草，并且这种草坪草达到发芽率最大值的速度最快。基于本实验的结果，种子萌发功能可以描述草坪草种子萌发对外部水分变化及其敏感性的响应。所获得的功能可用于对不同水分条件下种子萌发的动态变化进行定量研究，有助于提高对一系列水分条件下萌发最优拟合曲线的预测。
