Role of inorganic nitrogen in the synthesis and degradation of chlorophyll and carotenoids in maize leaves |
| |
Authors: | S N Mishra H S Srivastava |
| |
Institution: | (1) Department of Life Sciences, University of Indore, Vigyan Bhawan, Khandra Road, 452001 Indore, India |
| |
Abstract: | Supply of KNO3, NH4Cl or NH4NO3 to the maize seedlings increased total chlorophyll and carotenoids (over zero nitrogen control) amounts per fresh matter
unit of the primary leaves. The increase was most apparent when the pigment level in control plants started declining,i.e. between days 14 and 16. Supply of inorganic nitrogen increased pigment synthesis in excised leaf segments from dark grown
seedlings, although the increase during a 24 h incubation was not as high as with either glycine or glutamine. Salicylic acid
at 0.01 to 1 mM concentration increased and at 10 mM lowered the pigment biosynthesis. The increase at lower concentrations
of salicylic acid was unaffected by KNO3 but it was suppressed by NH4Cl. When 12-day seedlings were transferred to the dark, total chlorophyll and carotenoids declined appreciably, but the supply
of inorganic nitrogen protected them from decline to same extent. Thus inorganic nitrogen, especially the nitrate, is more
important in protecting from degradation of chlorophyll and carotenoids than in increasing their biosyntheses. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|