eprintid: 8065
rev_number: 7
eprint_status: archive
userid: 19
dir: disk0/00/00/80/65
datestamp: 2014-05-29 08:45:40
lastmod: 2014-05-29 08:45:40
status_changed: 2014-05-29 08:45:40
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@CGIAR.ORG
creators_name: Subbarao, G V
creators_name: Chauhan, Y S
creators_name: Johansen, C
icrisatcreators_name: Chauhan, Y S
affiliation: John F. Kennedy Space Center(FL)
affiliation: ICRISAT(Patancheru)
country: USA
country: India
title: Patterns of osmotic adjustment in pigeonpea — its importance as a mechanism of drought resistance
ispublished: pub
subjects: s1.2
full_text_status: restricted
keywords: Osmotic; Adjustment; Drought resistance; Genotypic differences; Grain yield; Pigeonpea
abstract: Osmotic adjustment (OA) is considered as an important physiological mechanism of drought adaptation in many crop plants. The present investigation was aimed at assessing the importance of OA in improving productivity under drought. Using two automated rain-out shelters, 26 extra-short-duration pigeonpea [Cajanus cajan (L.) Millsp.] genotypes were grown with irrigation during the growth period or with water deficit imposed from flowering until maturity. Mean leaf Ψs100 (60–92 DAS) under drought correlated significantly (r2=0.72**; n=26) to the mean OA (60–92 DAS) and contributed 72% of the genotypic variation in OA. Significant genotypic variation was observed in the initiation of OA, the duration of OA and the degree of OA. Based on the measured OA at 72, 82, and 92 days after sowing (DAS), genotypes were grouped into five different clusters. Genotypic differences in total dry matter production under drought were positively associated with OA at 72 DAS (r2=0.36**, n=26). Significant positive relationship between OA at 72 DAS and grain yield under drought was found (r2=0.16*; n=26). However, OA towards the end of pod filling phase, i.e. at 92 DAS, had a significant negative relationship with grain yield under drought (r2=0.21*; n=26). Genotypic differences in grain yield under drought was best explained using stepwise multiple regression to account for differences in OA at 72, 82, and 92 DAS (r2=0.41**; n=78). The degree of OA at 72 and 82 DAS contributed positively to the grain yield, whereas OA at 92 DAS contributed negatively to this relationship
date: 2000
date_type: published
publication: European Journal of Agronomy
volume: 12
number: 3-4
publisher: Elsevier
pagerange: 239-249
refereed: TRUE
issn: 1161-0301
official_url: http://dx.doi.org/10.1016/S1161-0301(00)00050-2
related_url_url: http://scholar.google.co.in/scholar?as_q=Patterns+of+osmotic+adjustment+in+pigeonpea+%E2%80%94+its+importance+as+a+mechanism+of+drought+resistance&as_epq=&as_oq=&as_eq=&as_occt=title&as_sauthors=&as_publication=&as_ylo=&as_yhi=&btnG=&hl=en&as_sdt=0%2C5
related_url_type: pub
citation:   Subbarao, G V and Chauhan, Y S and Johansen, C  (2000) Patterns of osmotic adjustment in pigeonpea — its importance as a mechanism of drought resistance.  European Journal of Agronomy, 12 (3-4).  pp. 239-249.  ISSN 1161-0301     
document_url: http://oar.icrisat.org/8065/1/European%20Journal%20of%20Agronomy_12_3-4_239%E2%80%93249_2000.pdf