1.BotanyA structure in seed plants that consists of the embryo sac surrounded by the nucellus and one or two integuments and that develops into a seed after it is fertilized. 2.ZoologyA small or immature ovum. [New Latinōvulum, diminutive of Latinōvum,egg; seeawi-inIndo-European roots...
A numerical investigation was conducted on the heat transfer from a uniformly powered strip source of heat located on the surface of a two-dimensional conducting substrate. The upper and lower surfaces of the substrate are cooled by forced laminar flow that is two-dimensional, steady and with con...
1) the number of ovules per flower 胚珠数 1. 05),betweenthe number of ovules per flowerand seed yield per hm2(r = 0. 通过对10个紫花苜蓿品种的花粉数量、胚珠数、花粉-胚珠比、花粉活力和种子产量进行了研究,结果表明紫花苜蓿每小花花粉数量(r=0。
Culture of unpollinated ovules, ovaries, and flower buds in some species of the genus Allium and haploid induction via gynogenesis in onion (Allium cepa L.) Induction of haploid plants is of great importance for breeding purposes because of the possibility to obtain from haploids homozygous ...
Methodologically, this work offers a new approach to further in vitro study on fertilization in angiosperms.doi:10.1016/0168-9452(87)90117-8ZhouC.Elsevier Ireland LtdPlant ScienceZhou C (1987) A study of fertilization events in living embryo sacs isolated from sunflower ovules. Plant Sci 52:147...
These chemicals are primarily sugary substances secreted by the ripened stigma of the flower. 4. Mechanism of Growth: The sugary substances act as a stimulus for the pollen grains. The pollen grains respond to this chemical stimulus by growing a pollen tube in the direction of the ovule. 5....
The induction rate depended mainly on genotype of the donor plant, and to lesser degrees, on floral stage, flower series and medium type. Multinuclear endosperms consisting of 10–37 nuclei were found in ovules after as few as 4 days of culture. In some ovules at this stage, the egg ...
Endogenous phytohormone level in flower buds at different development stages The concentrations of endogenous gibberellic acid (GA) and jasmonic acid (JA) in flower buds began to significantly increase in JCFII, but JA further experienced a dramatic increase in JCFIV. Additionally, the concentration ...
Pollen-pistil interactions are a fundamental process in the reproductive biology of angiosperms and play a particularly important role in maintaining incipient species that exist in sympatry. However, the majority of previous studies have focused on species with syncarpous gynoecia (fused carpels) and...
The 5′ region of the ACT11 gene, including the promoter region, the 5′-untranslated leader, the intron within the leader, and the first 19 actin codons, was fused to a β-glucuronidase (GUS) reporter gene. The expression of the ACT11/GUS fusion was examined histochemically in numerous ...