eprintid: 4021
rev_number: 10
eprint_status: archive
userid: 64
dir: disk0/00/00/40/21
datestamp: 2011-11-18 05:03:02
lastmod: 2014-01-16 14:16:37
status_changed: 2011-11-18 05:03:02
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@cgiar.org
item_issues_count: 0
creators_name: Saxena, K B
creators_name: Kumar, R V
creators_name: Gu, Yong
creators_name: Li, Zhenghong
creators_name: Gu, Yong
icrisatcreators_name: Saxena, K B
icrisatcreators_name: Kumar, R V
affiliation: ICRISAT(Patancheru)
country: India
title: Field studies on genetic variation for frost injury in pigeonpea
ispublished: pub
subjects: s1.2
full_text_status: public
abstract: Pigeonpea (Cajanus cajan) cultivation in China is being
revived primarily for soil conservation and fodder
production. Experiments show that in certain areas freezing
temperatures (<0°C) cause considerable damage to the
foliage of the crop. Considering the potential of pigeonpea
in China, this study was conducted to understand the
nature and magnitude of damage caused by freezing
temperatures and to assess the feasibility of identifying
freezing tolerant genotypes.
Three genotypes (ICPL 151, ICP 8863, ICP 11298)
bred by the International Crops Research Institute for the
Semi-Arid Tropics (ICRISAT), Patancheru, India and
one local landrace were evaluated. Four test sites were
selected in different agroecological zones in Yunnan
province in China. At each location, about 500 plants of
each genotype were grown in June 1999 in an unreplicated
block. The crop was grown with recommended cultural
practices. In September/October, 30 competitive plants
of each genotype were tagged randomly during the
vegetative stage and in January 2000, these plants were
scored for frost injury on five-point scale as: 0 = resistant,
no visible symptom of damage; 1 = tolerant, up to 10%
leaves killed; 2 = moderately tolerant, only terminal branches
and tender leaves killed; 3 = moderately susceptible,
upper-half of plant canopy killed; and 4 = susceptible,
entire plant killed. In March 2000, when the temperatures
for pigeonpea growth were conducive, 40 moderately
susceptible (score 3) plants were tagged randomly in
each block for visual assessment for their regeneration
capability. Mean frost injury grade (ã) and average frost
injury index (δ) were estimated for each genotype using
the formulae given by Wang (1987):
Σ (a × n) Σ (a × n)
ã =
________ δ = _______
N amax × N
where a = frost injury score; n = index in certain grade;
and N = total number of plants.
date: 2002
date_type: published
publication: International Chickpea and Pigeonpea Newsletter
number: 9
publisher: International Crops Research Institute for the Semi-Arid Tropics 
pagerange: 39-42
refereed: TRUE
related_url_url: http://scholar.google.co.in/scholar?hl=en&q=Field+studies+on+genetic+variation+for+frost+injury+in+pigeon+pea&btnG=Search&as_sdt=0%2C5&as_ylo=&as_vis=0
related_url_type: author
citation:   Saxena, K B and Kumar, R V and Gu, Yong and Li, Zhenghong and Gu, Yong  (2002) Field studies on genetic variation for frost injury in pigeonpea.  International Chickpea and Pigeonpea Newsletter (9).  pp. 39-42.      
document_url: http://oar.icrisat.org/4021/1/Field_studies_on_genetic_variation_for_frost_injury_in_pigeon_pea.pdf