Record Details

ORGANIC ACID EXUDATION UNDER PHOSPHORUS STRESS AND ITS RELATIONSHIP WITH PHOSPHORUS UPTAKE EFFICIENCY IN MUNGBEAN (Vigna radiata (L.) Wilczek)

KrishiKosh

View Archive Info
 
 
Field Value
 
Title ORGANIC ACID EXUDATION UNDER PHOSPHORUS STRESS AND ITS RELATIONSHIP WITH PHOSPHORUS UPTAKE EFFICIENCY IN MUNGBEAN (Vigna radiata (L.) Wilczek)
M Sc
 
Creator NAVAL KISHORA
 
Contributor Renu Pandey
 
Subject sowing, soaking, acidity, inorganic acids, sulphur, germinability, irrigation, application methods, seed treatment, solutes
 
Description T-8323
An attempt was made to study the organic acid exudation and its relationship
with phosphorus (P) uptake efficiency in mungbean genotypes grown under low (2
µM) and sufficient (100 µM) P conditions. Initially 60 genotypes were screened on
the basis of total plant dry weight and 44 were selected to screen them for total root
exudation. All the 44 genotypes grown at low and sufficient P were labeled with 14C
and total exudation was assessed by counting 14C. The genotypes were categorized
into four groups based on relative total root exudation and biomass at low and
sufficient P as, a) efficient and responsive (PDM-139) (b) efficient and nonresponsive
(SM-149, SM-9-206) (c) non-efficient and responsive (SM-9-117, SM-
262) and, (d) non-efficient and non-responsive (SM-9-202, SM-9-157). These 7
genotypes were used to measure root exudation and internal concentration of organic
acids (OA). The OA released in the rhizosphere under low P were mainly oxalic and
citric acids while those in root tissues were oxalic, succinic, lactic and maleic acids.
Synthesis of oxalic, succinic and lactic acids were higher under low P in root tissues
but they were not released into the rhizosphere. Among the morpho-physiological
parameters, the chl a, total chlorophyll and starch concentration were higher in low P
compared to sufficient P. Total leaf area per plant was significantly higher at
sufficient P in all the genotypes while specific leaf weight did not show any specific
trend between the different categories. Among the root morphological parameters, no
specific pattern was observed for root length, number of lateral roots and lateral root
density between the categories of genotypes while root surface area increased at low P
and the percentage of increase was higher in ENR genotypes. The P utilization
efficiency was higher in low P plants and the increase was maximum in genotypes
belonging to NER, ENR and ER category. Thus, this study shows that exudation of
organic acid in the rhizosphere is an important phenomena which in involved in
solubilizing the fixed P. The genotypes belonging to NER, ENR and ER released
higher amount of OA resulting in maximum PUE.
 
Date 2016-10-22T09:42:09Z
2016-10-22T09:42:09Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81336
 
Format application/pdf
 
Publisher IARI, DIVISION OF PLANT PHYSIOLOGY