在lophantha亚种中,广泛的晶状体形态与打破物理休眠有关。lophantha

IF 1.9 3区 生物学 Q2 PLANT SCIENCES
Geoff Burrows
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引用次数: 0

摘要

金合欢的分类经历了最近的剧变。最新的系统发育表明,狭义金合欢与其曾经归类的物种只有相对较远的亲缘关系。它的姐妹类群是单特异性的副蕨。本研究涉及lophantha亚种。lophantha,一种来自西澳大利亚西南部的物种,广泛入侵。这两个属的种子都具有物理休眠(PY)和透镜型水隙。对拟花属植物的种子结构,特别是晶状体结构进行了评价,并与金合欢进行了比较。种子批存活率几乎为100%,所有种子均含PY,平均种子质量为73 mg。种皮和胚对种子质量的贡献几乎相等,表明种皮相当。平均种皮厚度(410µm)和栅栏层厚度(163µm)均大于大多数所调查的金合欢物种。未爆裂的晶状体较小(0.11 mm2,约占种子表面积的0.15%)。用沸水处理1分钟,将晶状体与种子分离。晶状体栅栏细胞分离后面积增大约100%,表明晶状体栅栏细胞之前受到相当大的张力。在其他的破py处理中,晶状体会形成一个小丘或发生轻微的颜色变化。枇杷种子的基本结构与大多数金合欢种子相同,但种子较大且较重,种皮占种子的比例较大,栅栏细胞较长。不同的晶状体形态,与不同的休眠打破处理有关,很少被描述。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A wide range of lens morphologies is associated with breaking physical dormancy in Paraserianthes lophantha subsp. lophantha

The classification of acacias has gone through recent upheaval. The latest phylogenies indicate that Acacia sensu stricto is only relatively distantly related to the species with which it was once grouped. Its sister group is the monospecific Paraserianthes. This study concerns P. lophantha subsp. lophantha, a species from SW Western Australia that is widely invasive. Both genera have seeds with physical dormancy (PY) and a lens-type water gap. Seed structure, particularly that of the lens, was assessed in Paraserianthes and compared with Acacia. Seed batch viability was almost 100%, all seeds had PY and average seed mass was 73 mg. The seed coat and the embryo made almost equal contributions to seed mass, indicating a substantial seed coat. Average testa (410 µm) and palisade layer (163 µm) thicknesses were greater than in most investigated Acacia species. Unpopped lenses were small (0.11 mm2, about 0.15% of the seed surface area). With a 1 min boiling water treatment, the lens detached from the seeds. The palisade cells of the lens were about 100% larger in area after detaching, which indicates that they previously were under considerable tension. With other PY-breaking treatments, the lens formed a mound or a slight change in colour occurred. The seeds of Paraserianthes lophantha had the same basic construction as most Acacia seeds, although they were relatively large and heavy, the testa made up a large proportion of the seed and the palisade cells were long. Different lens morphologies, associated with different dormancy-breaking treatments, have rarely been described.

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来源期刊
Seed Science Research
Seed Science Research 生物-植物科学
CiteScore
3.60
自引率
4.80%
发文量
23
审稿时长
>12 weeks
期刊介绍: Seed Science Research, the official journal of the International Society for Seed Science, is a leading international journal featuring high-quality original papers and review articles on the fundamental aspects of seed science, reviewed by internationally distinguished editors. The emphasis is on the physiology, biochemistry, molecular biology and ecology of seeds.
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