Effect of reduced PAR on growth and photosynthetic efficiency of soybean genotypes

Authors

  • KIRAN P. BHAGAT ICAR-National Institute of Abiotic Stress Management (NIASM), Baramati, Pune, India
  • S.K. BAL ICAR-National Institute of Abiotic Stress Management, Baramati, Pune 413115
  • YOGESHWAR SINGH ICAR-National Institute of Abiotic Stress Management, Baramati, Pune 413115
  • S. POTEKAR ICAR-National Institute of Abiotic Stress Management, Baramati, Pune 413115
  • SUNAYAN SAHA ICAR-National Institute of Abiotic Stress Management, Baramati, Pune 413115
  • P. RATNAKUMAR ICAR-National Institute of Abiotic Stress Management, Baramati, Pune 413115
  • G.C. WAKCHAURE ICAR-National Institute of Abiotic Stress Management, Baramati, Pune 413115
  • P.S. MINHAS ICAR-National Institute of Abiotic Stress Management, Baramati, Pune 413115

DOI:

https://doi.org/10.54386/jam.v19i1.734

Keywords:

Light saturation point, PAR, Photosynthesis,, Shade-net structure, Source-sink relationship, Soybean

Abstract

Soybean is an important crop, and physiologically, it is photosensitive in nature and therefore, is likely to be highly affected by the atmospheric brown clouds (ABCs) which reduce PAR (Photosynthetically Active Radiation) availability, and moisture stress conditions those may prevail as a consequence of climate change scenario. Therefore, the impact of reduced natural PAR was evaluated on its determinate (DT; cv. JS-93-05), semi-determinate (SDT; cv. JS-335) and indeterminate (IDT; cv. Kalitur) genotypes. For simulating the reduced PAR condition, three different shapes of structures, viz., rectangular-cuboid, octagonal-dome and hemispherical-dome with shade-net covering were initially tested to check the uniformity of PAR availability inside the structure and the last one was found better. The light saturation point (LSP) was found to be 800, 1200 and 1000 PAR μmol m-2s-1 in case of DT, SDT and IDT genotypes,
respectively. Under reduced PAR and restricted irrigation condition, the photosynthetic rate was 20.8, 21.9 and 28.9 μmol m-2s-1 in case of DT, SDT and IDT cultivars, respectively, while their seed yields were 151.3, 238.7 and 264.2 kg ha-1 indicating better source-sink relations of the IDT cultivar. Therefore, it is projected that IDT cultivars are likely to be popular under futuristic scenarios of low PAR availability and water scarcities.

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Published

01-03-2017

How to Cite

KIRAN P. BHAGAT, S.K. BAL, YOGESHWAR SINGH, S. POTEKAR, SUNAYAN SAHA, P. RATNAKUMAR, G.C. WAKCHAURE, & P.S. MINHAS. (2017). Effect of reduced PAR on growth and photosynthetic efficiency of soybean genotypes. Journal of Agrometeorology, 19(1), 1–9. https://doi.org/10.54386/jam.v19i1.734

Issue

Vol. 19 No. 1 (2017): March

Section

Research Paper

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