Evaluation of pigeonpea (Cajanus cajan L. Millsp.) genotypes for phosphorus uptake efficiency
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Date
2008
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Publisher
CCSHAU
Abstract
An experiment was conducted with six pigeonpea genotypes namely
Paras, ICPL-88039, H2000-37, H2000-47, H2001-4,and H2001-37, at
different levels of phosphorus i.e. 15%, 30%, 60% and 100% in pot culture
house. Various parameters like fresh and dry weight of root and shoot, leaf
area, photosynthetic rate, total chlorophyll content, total phosphorus content
of root and shoot, total nitrogen content of root and shoot, fresh weight of
nodules, leghaemoglobin content, acetylene reduction activity, yield and its
attributing characters were analysed at three sampling stages i.e. 45, 75 &
110 days after sowing. Another experiment was conducted in laboratory with
four pigeonpea genotypes i.e. H2001-37, Paras, H2000-37 and ICPL-88039
with same treatments of phosphorus. However, the parameters studied were
root length, number of root hairs, root-shoot ratio and alkaline phosphatase
activity only 10 days after sowing
Maximum fresh wt. of the root was observed in ICPL-88039 and
minimum fresh weight was observed in H2001-37, whereas maximum
fresh weight of shoot was observed in H2000-37 genotype and
minimum was in Paras genotype.
Dry weight of root was maximum in H2001-27 whereas dry weight of
shoot was maximum in H2000-37. Minimum root was observed in
H2001-37 genotype whereas minimum dry weight of shoot was
observed in Paras genotype.
Photosynthetic rate, chlorophyll content, leaf area was maximum in
Paras genotype (Check variety). However, total phosphorus and
nitrogen content at low phosphorus application was better in H2000-37
genotype.
Nodule weight, acetylene reductase activity, leghaemoglobin content
was high in Paras & H2001-37 genotype. However at lower P
application H2001-37 performed better.
In second experiment, at low phosphorus application maximum root
length was observed in H2000-37 where number of root hairs were
highest in H2001-37 genotype. Phosphatase activity was highest in
H2001-37 genotype at low phosphorus application.
Description
Keywords
Genotypes, Vegetative propagation, Planting, Pigeonpeas, Sowing, Root nodulation, Drying, Enzymes, Yields, Nitrogen