Water permeability/impermeability in seeds of 15 species of Caragana (Fabaceae)
Water permeability/impermeability in seeds of 15 species of Caragana (Fabaceae)
复制标题
15 种锦鸡儿（豆科）种子的透水性/不透水性
DOI：
10.7717/peerj.6870
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发表时间：
2019-05-09
期刊：
影响因子：
2.7
通讯作者：
Hu, Xiaowen
中科院分区：
文献类型：
--
作者：
Chen, Dali;Zhang, Rui;Hu, Xiaowen
温带和北极地区的大多数豆科植物都有不透水的种子（物理休眠，PY）。然而，许多作者报道说，一些锦鸡儿属物种的种子是透水的，因此不休眠。我们 (1) 测试了 2014 年、2016 年和/或 2017 年在同一地点成熟的 15 种柠条属种子中是否存在 PY，(2) 确定干燥储存是否会降低或增加含有 PY 的种子百分比，以及 (3) 定位 11 种柠条属种皮上水进入种子的位点。 2016 年和 2017 年，C. roborovskyi 的种子中分别有 63% 和 45% 含有 PY，但其他 14 个物种的种子中只有 0-14% 含有 PY。不透水种子种皮栅层无裂纹，透水种子栅层有裂纹。采集年份和干燥储存对两个物种（C. acanthophylla 和 C. roborovskyi）的吸胀有显着影响。在测试的 11 个物种中的两个（C. acanthophylla 和 C. roborovskyi）中，种脐是水进入种子的部位（对照种子，不是任何休眠破碎处理），但对于其他 9 个测试物种来说，水通过种皮的所有部分进入。
Majority legumes in the temperate and arctic zones have water-impermeable seeds (physical dormancy, PY). However, various authors have reported that seeds of some Caragana species are water-permeable and thus non-dormant. We (1) tested seeds of 15 species of Caragana matured in the same site in 2014, 2016 and/or 2017 for presence of PY, (2) determined if dry storage decreased or increased the percentage of seeds with PY and (3) located the site on the seed coat of 11 species where water enters the seed. Sixty-three percent and 45% of the seeds of C. roborovskyi had PY in 2016 and 2017, respectively, but only 0–14% of the seeds of the other 14 species had PY. The palisade layer in the seed coat of water impermeable seeds had no cracks in it, whereas cracks were present in the palisade layer of water-permeable seeds. Year of collection and dry storage had significant effects on imbibition of two species (C. acanthophylla and C. roborovskyi). In two (C. acanthophylla and C. roborovskyi) of the 11 species tested, the hilum was the site of water entry into seeds (control seeds, not any dormant broken treatments), but for the other nine species tested water entered through all parts of the seed coat.