Key message

Embryonic axes of acorns have greater variability of mass than cotyledons or pericarp. Above/below ground seedling mass depends on oak species.

Abstract

Species of the genus oak are of great importance for forest ecosystems in almost all of the Holarctic. Knowledge of the diversity of the size of acorns and their parts would allow better use of the opportunity of genetic resources storage, both for the protection of endangered oak species and for forestry practices. The initial development of seedlings in reference to the size of the acorn, its parts and acorn maturation time was also investigated. The fresh and dry mass of individual acorns, embryonic axes and cotyledons of 15 species (Quercus agrifolia, Q. gambelli, Q. kelloggii, Q. alba, Q. bicolor, Q. coccinea, Q. falcata, Q. lyrata, Q. nigra, Q. prinus, Q. rubra, Q. cerris, Q. ilex, Q. petraea, and Q. robur) were determined. In the second part of the study, the mass of the ca. 3-month-old seedlings that had completed the first stage of growth, with a division on the leaves, the shoot and the root, was measured. The greatest variation in mass both between and within the species was demonstrated for the embryonic axis. The mass of seedlings depends on the size of the acorn and the cotyledons contained therein; whereas, the mass of the embryonic axis has no significant influence on the mass of seedlings.

中文翻译：

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栎属15种物种的胚轴，子叶，橡子和幼苗的大小变异性

关键信息

橡子的胚轴具有比子叶或果皮更大的质量变异性。地面以上/以下的幼苗质量取决于橡木的种类。

抽象

橡树属的物种对于几乎所有霍拉克特州的森林生态系统都至关重要。了解橡子及其各部分的多样性，将可以更好地利用遗传资源的存储机会，既可以保护濒危的橡树种，也可以用于林业。还参考了橡子的大小，其部分和橡子的成熟时间对幼苗的初步发育进行了研究。新鲜的和个别橡子，胚轴和的15种子叶（干质量栎agrifolia，Q. gambelli，Q. kelloggii，Q.粉，Q.双色，Q.红花，Q.楹，Q.胡菜，Q.黑，Q. prinus，Q.杨梅，Q.栎，Q.冬青，Q.佩特拉行省，和Q.栎）进行了测定。在研究的第二部分中，测量了三个月大的幼苗，该幼苗已经完成了生长的第一阶段，并在叶片，枝条和根部进行了划分。物种之间和内部的质量最大变化体现在胚轴上。幼苗的质量取决于橡子和子叶中所含子叶的大小。而胚轴的质量对幼苗的质量没有显着影响。