| Autor: |
Sathee L; Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India. lekshmyrnair@gmail.com., Jain V; Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India. tellvanita@gmail.com.; Agricultural Education Division, ICAR, KAB-II, New Delhi, India. tellvanita@gmail.com. |
| Jazyk: |
angličtina |
| Zdroj: |
Protoplasma [Protoplasma] 2022 May; Vol. 259 (3), pp. 703-716. Date of Electronic Publication: 2021 Aug 10. |
| DOI: |
10.1007/s00709-021-01692-4 |
| Abstrakt: |
Plant's stomatal physiology and anatomical features are highly plastic and are influenced by diverse environmental signals including the concentration of atmospheric CO 2 and nutrient availability. Recent reports suggest that the form of nitrogen (N) is a determinant of plant growth and nutrient nitrogen use efficiency (NUE) under elevated CO 2 (EC). Previously, we found that high nitrate availability resulted in early senescence, enhanced reactive oxygen species (ROS), and reactive nitrogen species (RNS) production and also that mixed nutrition of nitrate and ammonium ions were beneficial than sole nitrate nutrition in wheat. In this study, the interactive effects of different N forms (nitrate, ammonium, mixed nutrition of nitrate, and ammonium) and EC on epidermal and stomatal morphology were analyzed. Wheat seedlings were grown at two different CO 2 levels and supplied with media devoid of N (N 0 ) or with nitrate-N (NN), mixed nutrition of ammonium and nitrate (MN), or only ammonium-N (AN). The stoma length increased significantly in nitrate nutrition with a consistent reduction in stoma width. Guard cell length was higher in EC treatment as compared to AC. The guard cell width was maximum in AN-grown plants at EC. Epidermal cell density and stomatal density were lower at EC. Nitrate nutrition increased the stomatal area at EC while the reverse was true for MN and AN. Wheat plants fertilized with AN showed a higher accumulation of superoxide radical (SOR) at EC, while in NN treatment, the accumulation of hydrogen peroxide (H 2 O 2 ) was higher at EC. Reactive oxygen species, particularly H 2 O 2 , can trigger mitogen-activated protein kinase (MAPK) mediated signaling and its crosstalk with abscisic acid (ABA) signaling to regulate stomatal anatomy in nitrate-fed plants. The SOR accumulation in ammonium- and ammonium nitrate-fed plants and H 2 O 2 in NN-fed plants might finely regulate the sensitivity of stomata to alter water/nutrient use efficiency and productivity under EC. The data reveals that the variation in anatomical attributes viz. cell length, number of cells, etc. affected the leaf growth responses to EC and forms of N nutrition. These attributes are fine targets for effective manipulation of growth responses to EC.
(© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.) |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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Full text from SpringerLink