Chlorophyll a fluorescence determines the drought resistance capabilities in two varieties of mycorrhized and non-mycorrhized Glycine max Linn

Arbuscular mycorrhizal fungi, namely, Glomus mosseae and Glomus intraradices, and an endophyte, Piriformospora indica was used to assess the growth of two varieties (JS 335 and TAMS 98-21) of soybean (Glycine max L.) subjected to drought stress. Chlorophyll a fluorescence was measured by Handy PEA (plant efficiency analyzer) and analyzed by Biolyzer programme. The JIP-test (Chlorophyll a fluorescence rise at J I and P steps) was applied to evaluate in vivo vitality based on in vivo biospectroscopy, which supplied images, spectra and kinetics. We report that in JS-335 variety of soybean, G. intraradices induced the highest drought resistance followed by G. mosseae and P. indica, whereas in TAMS 98-21 variety, G. mosseae induced highest drought resistance followed by G. intraradices and P. indica.