National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
We investigated the interaction of elevated (CO2) on partitioning of carbohydrate from shoot to root under phosphorus (P) stress. Experiment was conducted on wheat varieties (Triticum durum (PDW-233) and Triticum aestivum (PBW-396) to study the interactive effects of P (5 µM and 500 µM) and (CO2) (400 and 700 µL L-1) was taken. In P-starved plants higher growth was observed at elevated (CO2). Under nutrient deficiency and/or elevated (CO2) higher root-to-shoot ratio was observed and increasing nutrient uptake by providing more root surface. P levels or (CO2) did not cause significant changes to the leaf soluble sugar content, whereas starch concentration increased at low P, irrespective of the CO2 treatment. The chla and total chlorophyll varied significantly only due to nutrient treatment while chlb was also influenced by (CO2). The root protein averaged over nutrient treatment increased by 16% in PDW-233 whereas it reduced by 30% in PBW-396 as compared to ambient (CO2).PDW-233 recorded higher shoot and root protein averaged over (CO2) and nutrient treatments. The root dry weight was almost doubled in both varieties at e(CO2) while the total biomass accumulation increased by 54 to 70%. PBW-396 responded to e(CO2) in terms of biomass accumulation under low P compared to PDW-233the sugar concentration was more than doubled in PBW-396 as compared to PDW-233. The increase in reducing, non-reducing and total sugars at low P was 40, 122 and 93%, respectively as compared to control. This experiment shows that extra CO2 help to ameliorate the effect of P deficiency. The severe effects of P deficiency on growth and development of wheat plant was mitigated to some extent by elevated (CO2).
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