Morphological characteristics and proportion of leaf blade tissues of elephant grass clones under sheep grazing

B. L. Viana, A. Mello, A. Guim, M. A. Lira, J. C. B. Dubeux Júnior, M. V. F. Santos, M. V. Cunha
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引用次数: 4

Abstract

Abstract: The objective of this work was to characterize morphologically elephant grass (Pennisetum purpureum) genotypes and to estimate their proportions of leaf blade tissues under grazing. Two tall varieties (Elephant B and IRI-381) and three short ones (Mott, Taiwan A-146 2.37, and Taiwan A-146 2.114) were evaluated under intermittent sheep grazing as to the following morphological characteristics: plant height, internode length, and leaf blade/culm ratio. Moreover, the proportions of the following leaf blade tissues were estimated: sclerenchyma, adaxial and abaxial epidermis, bulliform cells, vascular bundles, phloem, vascular sheath, xylem, and mesophyll. The short varieties were 28.6% shorter than the tall ones and showed higher leaf blade/culm ratio; Mott and Taiwan A-146 2.114 had the shortest internodes of 3.9 and 4.7 cm, respectively, over ten grazing cycles. The clones differed regarding their proportions of leaf blade tissues, except for abaxial epidermis, phloem, and xylem. The differences in morphological characteristics indicate that the short clones Mott and Taiwan A-146 2.114 are better adapted to sheep grazing, and, therefore, may be recommended for the improvement of pastures.
放牧条件下象草无性系叶片组织形态特征及比例研究
摘要/ Abstract摘要:研究放牧条件下象草(Pennisetum purpureum)基因型的形态特征及其在叶片组织中的比例。以2个高品种(象B和ir -381)和3个矮品种(莫特、台湾A-146 2.37和台湾A-146 2.114)为研究对象,对其株高、节间长和叶片/秆比进行了评价。此外,还估算了叶片组织的比例:厚壁组织、正面和背面表皮、球状细胞、维管束、韧皮部、维管鞘、木质部和叶肉。矮品种比高品种矮28.6%,叶茎比较高;在10个放牧周期内,莫特和台湾A-146 2.114的节间最短,分别为3.9和4.7 cm。不同无性系的叶片组织比例存在差异,除了背面表皮、韧皮部和木质部。形态特征的差异表明,矮系莫特和台湾A-146 2.114更适合放牧,可作为改良草场的推荐品种。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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