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Seed Number and 100-seed Weight of Pearl Millet (Pennisetum glaucum L.) Respond Differently to Low Soil Moisture in Genotypes Contrasting for Drought Tolerance

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Relation http://oar.icrisat.org/7303/
http://dx.doi.org/10.1111/jac.12052
 
Title Seed Number and 100-seed Weight of Pearl Millet
(Pennisetum glaucum L.) Respond Differently to Low Soil
Moisture in Genotypes Contrasting for Drought Tolerance
 
Creator Aparna, K
Hash, C T
Yadav, R S
Vadez, V
 
Subject Millets
 
Description Water stress after flowering, one of the major factors limiting yields of pearl millet,
affects both seed setting and grain filling and is a consequence of more/less
water used prior to anthesis. However, whether genotypes have different sensitivities
for seed setting and filling under drought, if exposed to similar stress intensity,
is unclear. Experiments were conducted in two pairs of pearl millet
genotypes, that is, PRLT2/89-33 and H77/833-2, 863B and 841B, contrasting for
terminal drought tolerance, and two genotypes, ICMR 01046 and ICMR 01029
(IL-QTLs), introgressed with a terminal drought tolerance QTL from PRLT2/89-
33 into H77/833-2. Total seed weight, panicle number, 100-seed weight, seed
number and stover biomass were measured at different soil moistures and
throughout grain filling. Sensitive H77/833-2 had higher seed number and yield
under well-watered (WW) conditions than in PRLT2/89-33 and IL-QTLs. Upon
increases in water stress intensity, H77/833-2 suffered losses mostly in stover biomass
(45 %) and seed number (60 %) at 0.3 FTSW whereas the biomass and seed
number of PRLT2/89-33 decreased little (20 % and 25 %). The 100-seed weight
of H77/833-2 decreased only 20 % under stress. Tolerant 863B also maintained a
higher seed number and biomass under water stress than 841B. Grain filling
duration in PRLT2/89-33 and IL-QTLs was similar to that of H77/833-2 under
WW conditions but lasted longer than in H77833-2 under water stress (WS).
Similarly, seed growth of 863B was longer than 841B under WS. It is concluded
that the higher seed yield of tolerant parents PRLT2/89-33 and 863B, and of ILQTLs
under WS was explained by the retention of a higher number of seeds than
in sensitive lines, while the decrease in the 100-seed weight was proportionally
less than the decrease in seed number. Phenotype with lesser number and larger
size of panicles and larger grain size, like genotypes PRLT2/89-33 and 863B, withstood
post-anthesis water stress better. IL-QTL inherited part of these characteristics,
indicating a role for the terminal drought QTL in maintaining larger seed
number and higher 100-seed weight. The continuous stover biomass increase
under WW in H77/833-2, due to tillering, might indicate that tiller growth and
grains are in competition for resources after anthesis, and this may relate to the
relatively shorter grain-filling period.
 
Publisher Wiley-Blackwell
 
Date 2013
 
Type Article
PeerReviewed
 
Format application/pdf
application/pdf
application/vnd.ms-excel
 
Language en
en
en
 
Rights —
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Identifier http://oar.icrisat.org/7303/1/J-Agro-Crop-sci_2013.pdf
http://oar.icrisat.org/7303/7/sup-FigureS1.pdf
http://oar.icrisat.org/7303/8/Data-FigureS1.xlsx
Aparna, K and Hash, C T and Yadav, R S and Vadez, V (2013) Seed Number and 100-seed Weight of Pearl Millet (Pennisetum glaucum L.) Respond Differently to Low Soil Moisture in Genotypes Contrasting for Drought Tolerance. Journal of Agronomy and Crop Science. pp. 1-13. ISSN 1439-037x