Early workers believed that inorganic salts were passively carried into the plant through diffusion with the absorption of water and further assumed that the translocation of the absorbed salts to different parts of the plant was dependent on transpiration. It is known that certain ions may attain a higher concentration in the cell sap of plant tissues than in the [...]
IN this article we will discuss about the Subject-Matter and Mechanism of Nitrogen Fixing Systems. Subject-Matter of Nitrogen Fixing Systems: Blue-green algae share with bacteria the potentiality of fixing atmospheric nitrogen. To date, nearly 50 spp. are reported to be active nitrogen fixers. Nitrogen fixation was demonstrated initially in Nostocpunctiformae and Anabaena sp. In 1968, Fay made the suggestion that [...]
In plants, there is a photo reversible pigment which is called phytochrome (P), chromophoric protein, and exists in two forms: one which absorbs red (Pr) and the other one which absorbs far-red light (Pfr). Bestowed with such a versatility of the molecule, several bio-chemicals, physiological and morphogenetic responses can be regulated in the plants. It was in 1920 that Gardner [...]