NDLI: Nitrate reductase activity of radish cotyledons as affected by phytohormones and different nitrogen sources

Content Provider	Springer Nature Link
Author	Sood, C. R. Chanda, S. V. Singh, Y. D.
Copyright Year	2000
Abstract	Radish (Raphanus sativus L.) seedlings pretreated with different hormones viz. kinetin, gibberellic acid and abscisic acid were subjected to different N-forms. The seedlings were treated with different concentrations of KNO$_{3}$, NH$_{4}$Cl and NH$_{4}$NO$_{3}$ and the changes in nitrate reductase activity were seen in light and dark conditions in the cotyledons. Nitrate reductase activity was affected differently by hormone application. Nitrate increased and ammonia decreased nitrate reductase activity; in both light and dark-grown seedlings KNO$_{3}$ induced more in vitro nitrate reductase activity. NH 4 + when combined with NO 3 − , however, could level up to some extent, with KNO$_{3}$ in light, except in kinetin. A transient response of induction of NR activity was evident with decreased levels after a certain specific ambient N-concentration, despite the presence of high N in the medium. However, the pattern of transition varied with the hormones applied. Further, hormones are found to affect induction of different isoforms of nitrate reductase by NH 4 + and NO 3 − . NH 4 + induced isoform was prominently promoted by kinetin treatment in dark. The data documents a particular kind of interaction between controlling factors (light, N-source and phytohormones) which affect nitrate reductase levels.
Starting Page	477
Ending Page	482
Page Count	6
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	22
Issue Number	4
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Phytohormones Nitrate reductase activity Radish cotyledons nitrogen sources Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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