E. 1992: Effects of pollen tube number and archegonium number on reproduction in Douglas-fir: significance for seed orchard manage- ment. Call. J . For. Re.\.. 2233483-1488.Crook, R.W., and Friedman, W.E. 1992. Effects of pollen tube number and archegonium number on reproduction in...
Beside this principal function, the pollen tubes of certain angiosperms also have a haustorial function during the development of the ovule after fertilisation (Johri 1992). Almost all pollen grains are monosiphonous, i.e. each pollen grain produces only one pollen tube. Other pollen, such as...
The morphology of pollen tetrads and viscin threads is described in fossil Ericaceae pollen from various Eocene/Oligocene/Miocene localities in Europe (Ger... R Zetter,M Hesse - 《Grana》 被引量: 99发表: 1996年 Pollen Morphology of Rhododendron Subgenus Azaleastrum Pollen grains of 20 species...
The typical pollen grain at the time of its release from the anther consists of two haploid cells: a larger vegetative cell that elongates to form the pollen tube and a smaller generative cell that divides to produce two male sex cells, each of which is involved in a separate fusion event...
Origin and Significance of Tube Structures in Neoproterozoic Post-glacial Cap Carbonates: Example from Noonday Dolomite, Death Valley, United States TheNeoproterozoicNoondayDolomite(DeathValley,USA),apost-glacialcapcarbonate,containscloselypacked,meter-long,cm-wide,tube-likestructuresthatdefinethevertic... ...
another dioecious gymnosperm of considerable antiquity1. Reproduction in all other gymnosperms and in flowering plants is siphonogamous. Here fertilisation occurs through a pollen tube which conveys the non-motile male gamete to the egg. A pollen tube is produced in the zooidogamous gymnosperms, ...
Effect of Stigmatic Exudate Injected into the Stylar Canal on Compatible and Incompatible Pollen Tube Growth in Lilium longiflorum Thunb. * in the stylar canal on pollen tube growth per se was tested by injecting exudates from the same cultivar as the style and self- or cross-pollinating... PD...
Used parts of edible plants by Baiku Yao people Full size image The data further include 14 species with edible whole plants, 13 with tuberous roots, 11 with seeds, and 10 with tubers. Lesser encountered categories are stems with 5 species, roots and flowers (young inflorescence), each with...
A tube-shaped midgut of three millipedes examined spreads along the entire length of the middle region of the body. The epithelium is composed of digestive, secretory and regenerative cells. The digestive cells are responsible for the accumulation of metals and the reserve material as well as ...
start of text character 报文起始字符,正文起始符 start of heading character 报文开始字符 be of no significance 无关紧要 start in 开始,开始雇用,开始任职 相似单词 significance n. 1. 意义,意思 2. 重大意义,重要性 Start vi. 开始,起身,出发,跳起,吃惊,出现 n. 惊起,出发,开端,起点,吃惊,...