This study provides monitoring airborne pollen grains which indication to regional vegetation types, risks of allergic reactions due to some pollen types e.g. Grasses and climatic changes. The concentration of TSP for 24 hrs was higher than AQL of Law 4 for 1994 in different months such as (...
densiflora pollen tubes resembled those of the coleoptiles rather than those of angiosperm pollen tubes. [Cf. F.A. 20 No. 4148. KEYWORDS: Botany general \ plant growth regulators \ plant growth regulators \ effects \ pollen germination \ physiology \ plant physiology \ Pinus densiflora physiology...
In the pollen transformation method, the desired foreign gene is introduced into the pollen grains viaAgrobacteriumor directly with naked DNA [77] (Fig.3b). Following this step, the transformed pollen grains are subsequently used to pollinate the stigma and fertilize the recipient eggin vivo.Polle...
reproductive barriers can occur either before (pre-zygotic) or after (post-zygotic) fertilization. In plants, the pre-zygotic barriers include geographical isolation, differentiations in flower habit, failure in cell-to-cell recognition between the pollen and stigma, inability in ...
All anthers shed pollen simultaneously, just after tepals were expanded. Ten flowers produce 10.6-12.8 mg of pollen. The pollen viability ranged from 58 to 92%. The length of longitudinal equatorial axis (E) in Camassia Lindl. pollen grains reached 57,7 m....
The biosynthesis of sesquiterpene volatiles, which are emitted with a light-dependent diurnal pattern early in the morning at prebloom and bloom, is localized to anthers and, more specifically, within the developing pollen grains. Valencene synthase (VvValCS) enzyme activity, which produces the ...
A temperature rise above 30 degrees Celsius leads to the death of pollen grains, the failure to fill the grain, and the failure to form the grain itself [56]. Drought inhibits shoot development while stimulating root growth and decreasing chlorophyll content [57]. Wheat plants enhance canopy ...
they do not produce high-resolution spatial information nor do they provide information concerning cell-to-cell variation. Nevertheless, this approach has proven successful in certain cases including reproductive cells (pollen grains and egg cells), mesophyll cells, and specialized epidermic cells (root...
Isoelectric focusing of proteins from single pollen grains of Cucurbita pepo L. has been developed for large scale study of pollen grain populations' heterogeneity. Forty to forty-five protein bands from one pollen grain are revealed after silver staining. Applications of this technique to pollen gra...
pollen tubes had already started. [74] observed that about 2 weeks before anthesis Cabernet Sauvignon anther membranes were degraded and mature pollen grains had been released, while the cap was still attached to the flower. At this stage, an early seed structure had begun to develop. Given...