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Cultivar Specific Response of CO 2 Fertilization on Two Tropical Mung Bean ( V igna radiata L .) Cultivars: ROS Generation, Antioxidant Status, Physiology, Growth, Yield and Seed Quality
Author(s) -
Mishra A. K.,
Agrawal S. B.
Publication year - 2014
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 - 10.1111/jac.12057
Subject(s) - cultivar , catalase , vigna , superoxide dismutase , radiata , chemistry , crop , yield (engineering) , horticulture , photosynthesis , legume , antioxidant , agronomy , biology , botany , biochemistry , materials science , metallurgy
Increasing atmospheric carbon dioxide concentration ( CO 2 ) is an important component of global climate change that will have a significant impact on the productivity of crop plants. In recent years, growth and yield of agricultural crop plants have been shown to increase with elevated CO 2 ( EC ) and have enticed considerable interest due to variation in the response of crop plants. In this study, comparative response of two mung bean cultivars ( HUM ‐2 and HUM ‐6) was evaluated against EC at different growth stages under near‐natural conditions for two consecutive years. The plants were grown in ambient as well as EC (700 ppm) in specially designed open‐top chambers. Under elevated CO 2 , marked down‐regulation of reactive oxygen species ( ROS ) levels, membrane disruption and activities of superoxide dismutase and catalase were noticed in both the cultivars, but the extent of reduction was more in HUM ‐6. As compared to ambient CO 2 , EC increased total chlorophyll, photosynthetic rate, growth and yield parameters. Cultivar‐specific response was noticed as HUM ‐6 showed higher increase in yield attributes than HUM ‐2. Under CO 2 treatment, soluble protein and reducing sugars decreased while total soluble sugars and starch showed an opposite trend. Principal component analysis showed that both the cultivars responded more or less similarly to EC in their respective groupings of physiological and growth parameters, but the magnitude of ROS and antioxidative enzymes was variable. The experimental findings depict that both the cultivars of mung bean showed contrasting response against EC and paved the way for selecting the suitable cultivar having higher productivity in a future high‐ CO 2 environment.