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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue May 2017, 38 (3)                                     Back


nstantaneous and historical temperature effects on a-pinene

Influence of ethylene and cobalt chloride on photosynthetic parameters and pedicel anatomy of pigeonpea (Cajanus cajan L.) genotypes

 

K. Pahwa1*, N. Ghai1, J. Kaur2, I. Singh2, S. Singh2 and M. Dhingra1

1Department of Botany, Punjab Agricultural University, Ludhiana-141 004, India

2Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana-141 004, India

*Corresponding Author E-mail: kanchan.pahwa@gmail.com

 

 

 

Key words

Chlorophyll kinetics,

Photosynthesis,

Regression,

Stomatal conductance

 

 

 

Publication Data

Paper received : 31.03.2015

Revised received : 28.11.2015

Re-revised received : 31.03.2016

Accepted :  09.05.2016

 

Abstract

Aim: A study was conducted with an aim to observe the effect of foliar application of ethylene (100 and 200μgml-1) and CoCl2 (10 and 15μgml-1) at pre-flowering and post-flowering stages on different photosynthetic parameters viz., photosynthetic rate, internal CO2 concentration, stomatal conductance, chlorophyll kinetics (Fv/Fm), total chlorophyll content and anatomy of pedicel of flower.

 

Methodology: Crop was foliarly sprayed with ethylene (100 and 200μgml-1) and CoCl2 (10 and 15μgml-1) at pre-flowering and post-flowering stages. All parameters were recorded at vegetative, flowering and post flowering stages. Microtomy was done from pedicel of flower to observe the effect of treatments on conducting tissue.

 

Results: Different treatments significantly increased the photosynthesis related parameters. Lower concentration of ethrel sprayed at pre- flowering stage and cobalt chloride sprayed at post-flowering stage was most effective in increasing these parameters, and hence yield of crop. Maximum rate of photosynthesis and chlorophyll content was observed at flowering stage. Among the genotypes, AL 1578 recorded highest rate of photosynthesis and related parameters in all the treatments. Significant positive correlation of photosynthetic rate was observed with chlorophyll content and specific leaf weight. From the relationship between SLW and chlorophyll content with photosynthesis, it was observed that 87 % variation in rate of photosynthesis could be explained by variations in chlorophyll content and 67% variability in photosynthetic rate could be explained by variability in SLW. The area of conducting tissues viz. xylem and phloem in pedicel of flower was found to be maximum in treated plants which led to increased translocation of photosynthates and hence, seed yield.

 

Interpretation: Ethrel (100 μgml-1)   sprayed at pre- flowering stage and cobalt chloride (10 μgml-1) sprayed at post-flowering stage was most effective in increasing photosynthesis and related parameters and hence, yield of crop. 

 

 

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