Scientific research towards improving the biomass productivity of crops has become
inevitable because of the inherent constraints t()wards improving the biomass partitioning.
This factor alone So far has been of great significance for rapid spurt in economic yield.
Photosynthetic efficiency is expected tobe directly related to biomassproduction. Hitherto,
this traithas not been affected byselectionand genetic improvement. Asubstantial number
of photosynthetic mutants have been isolated and characterised but it remains an open
question yet as to what component or step(s) in photosynthesis are rate limiting under
specified conditions. In the absence of this knOWledge, screening of genotypes for
maximum photosynthesis rate (PmaJ has been resorted to, but it may not be directly
correlated with yield. Adequate genetic variability has been reported for this trait along
with fair degree of genetic advance. Further, where the factors responsible for diluting the
assodation of biomass prod\1ctivity with photosynthetic efficiency were taken care of,
perfect relations ,have been established. The incorporation of photosynthetic indices in
breeding protocols is, therefore, strongly advocated and depending on the nature of gene
action appropriate breeding programme formulated. Further stability and adaptability
studies are unavoidable as photosynthetic indices are labile to the environmental
conditions. Integration of the tools of classical genetics and molecular biology in
manipulating theph<ltO$ynthetic efficiency for improving biomass productivity will
become an absolute necessity in the years to come.
Keywords: Photosynthesis, photosynthetic efficiency, photosynthetic apparatus, biomass, crop productivity.
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
K. R. SARKAR, H. MEHTA AND S. K. SHARMA info_circle