STUDIES ON IMPACT OF ELEVATED CARBONDIOXIDE ON AM FUNGAL INTERACTION EFFECT IN RICE (VARIETY: NAVEEN) UNDER FLOODED CONDITION
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Date
2017
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Indira Gandhi Krishi Vishwavidhyalaya, Raipur
Abstract
The present investigation entitled “Studies on impact of elevated Carbon dioxide on AM fungal interaction effect in rice (variety: Naveen) under flooded condition” was carried out during Kharif season of 2016-17 at Research Farm, ICAR-NRRI, Cuttack, Odisha. The experiment was laid out in completely randomized design with four treatment and four replication under ambient and elevated CO2 (550 ppm and 700 ppm) condition. The following four treatments viz Soil without AM fungi, Application of AM fungi at the time of transplanting, Transplanting of pre-mycorrhized seedling, Pre-mycorrhized seedlings with basal application of AM fungi under three different carbon dioxide conditions such as ambient, 550 ppm and 700 ppm were adopted. All these treatments were maintained in pot under Open Top Chamber. This experiment was conducted with main aim to understand whether recommended dose of fertilizers have any impact on AM fungi inoculation in low land rice (Oryza sativa L.) cultivation under ambient and elevated CO2 condition. Application of AM fungi either through nursery or nursery cum basal application found significantly increased plant dry biomass i.e. shoot and roots under ambient and elevated CO2 concentrations, however the performance was observed to be better at elevated CO2 conditions. The AM fungal root colonization and sporulation were 2 to 3 times higher in pre-mycorrhized seedlings transplanted treatments as compared to uninoculated control. At eCO2 conditions, 25-35% higher AM fungal root colonization was observed compared to ambient condition.
The present study indicated that microbial population was not found much variation among different treatments. The plant phosphorous uptake was recorded 20-27 % higher in AM fungi inoculated treatments as compared to uninoculated control in both ambient and eCO2 conditions.
The effect of AMF inoculation on various organic acid secretions in root exudates indicated that Oxalic acid was found to be 30-35% higher in AM inoculated treatments compared to uninoculated control. Malic acid was detected only in pre-mycorrhized seedlings at 550 ppm eCO2. Similarly, lactic acid was detected only in treatments which received pre-mycorrhized seedlings with basal application of AMF (T4) at 700 ppm eCO2. None of the treatments recorded both citric acid and succinic acid at ambient as well as eCO2.
Among different mode of AM fungi applications, pre-mycorrhized seedlings with basal application found to be superior in enhancing rice yield as compared to other methods, the same treatment which recorded 18 -27% higher yield as compared to uninoculated control. Grain N, P and Zn content was significantly increased in AMF inoculated treatments than uninoculated control. Finally, this finding conclude that transplanting of pre-mycorrhized rice seedlings significantly increased plant growth, nutrient uptake, 18-27% higher yield and higher zinc content in rice grain compared to uninoculated control under anaerobic cultivation of rice in both ambient and elevated CO2 condition.
Description
STUDIES ON IMPACT OF ELEVATED CARBONDIOXIDE ON AM FUNGAL INTERACTION EFFECT IN RICE (VARIETY: NAVEEN) UNDER FLOODED CONDITION
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