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Stability of soil plant analytical development (SPAD) chlorophyll meter reading (SCMR) and specific leaf area (SLA) and their association across varying soil moisture stress conditions in groundnut (Arachis hypogaea L.)

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Relation http://oar.icrisat.org/1121/
http://dx.doi.org/10.1007/s10681-007-9581-5
 
Title Stability of soil plant analytical development (SPAD) chlorophyll meter reading (SCMR) and specific leaf area (SLA) and their association across varying soil moisture stress conditions in groundnut (Arachis hypogaea L.)
 
Creator Nigam, S N
Aruna, R
 
Subject Groundnut
 
Description The complex nature of physiological
traits associated with drought tolerance and the
difficulties associated with their measurements in
segregating populations and large number of genotypes
inhibited their use in the past in developing
water-use efficient genotypes in breeding programmes.
With new knowledge of easily measurable
surrogates of transpiration efficiency (TE), a
trait associated with drought tolerance—specific leaf
area (SLA) and soil plant analytical development
(SPAD) chlorophyll meter reading (SCMR), it is
now possible to integrate TE through the surrogates
in breeding and selection schemes in groundnut
(Arachis hypogaea L.). As a noninvasive surrogate of
TE, SCMR is easy to operate, reliable, fairly stable
and low cost. However, in a large-scale breeding
program, it is difficult to complete SCMR observations
within a specified time. The present study
addressed the issue as to what extent the SCMR
measurements can be spread over time by evaluating
18 diverse groundnut genotypes for two physiological
traits, SCMR and SLA in two postrainy (Nov–Apr)
seasons (2002/2003 and 2003/2004) in India. Observations
were recorded at different times during and
after the release of moisture deficit stress. There was
general agreement in genotype and trait performance
in both the seasons. Interaction between SCMR and
time of observation was significant in only one season
(2002/2003) but its variance relative to genotypes and
time of observation was very small. ICGV 99029 and
ICR 48, which recorded higher SCMR and lower
SLA values in both the seasons, will make good
parents for water-use efficiency trait in breeding
programmes. Other good parents include ICGS 76,
TCGS 647 and TCGP 6. SCMR recorded at three
different times under differing soil moisture deficit in
each season showed highly significant correlation
with each other. Similarly, SLA at different times
also correlated significantly with each other. SCMR
and SLA were significantly negatively correlated
with each other and the relationship was insensitive
to time of observation. The results of the present
study indicated that SCMR/SLA observations can be
recorded at any time after 60 days of crop growth,
preferably under moisture deficit conditions. This
gives groundnut breeders a large flexibility to record
these observations in a large number of segregating
populations and breeding lines in the field. Thus,
making it easy to incorporate these physiological
traits associated with drought tolerance in breeding
and selection scheme in groundnut.
 
Publisher Kluwer
 
Date 2008
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/1121/1/Nigam2008.pdf
Nigam, S N and Aruna, R (2008) Stability of soil plant analytical development (SPAD) chlorophyll meter reading (SCMR) and specific leaf area (SLA) and their association across varying soil moisture stress conditions in groundnut (Arachis hypogaea L.). Euphytica, 160 (1). pp. 111-117.