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Variation in Photosynthetic Traits in Barnyard Millet ( Echinocloa frumentaceae ) Genotypes
Author(s) -
Subrahmanyam D.,
Rathore V. S.
Publication year - 1999
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1046/j.1439-037x.1999.00341.x
Subject(s) - photosynthesis , biology , transpiration , stomatal conductance , dry matter , water use efficiency , agronomy , zoology , horticulture , botany
A field experiment was conducted to assess the genotypic variability in 41 divergent barnyard millet ( Echinocloa frumentaceae L.) genotypes. A high degree of variation was observed for photosynthesis and other related characteristics. However, for specific leaf weight (SLW), the differences amongst genotypes were non‐significant. The seasonal means of photosynthetic rate (A), stomatal conductance (gs), transpiration (E), A/Ci ratio and total dry matter at harvest were positively and significantly correlated. None of the other parameters showed any significant relationship with total dry matter recorded at harvest. Leaf photosynthetic rate showed a positive but non‐significant relationship with SLW, and it is suggested that photosynthesis rate seems to be the best selection criterion in barnyard millet. A strong and positive relationship was observed between A/E ratio, A/Ci ratio and A/gs ratio, indicating that both A/Ci ratio and A/gs had a strong influence on the water use efficiency of the leaf.