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Ramazanzadeh S.,Islamic Azad University at Mashhad | Beheshti A.,Khorasan Agricultural and Natural Resource Research Center | Asgharipour M.R.,University of Zabol
Advances in Environmental Biology | Year: 2012

Remobilizations of storage material from vegetative organs to grains compensate economic yield particularly in drought stress conditions. In this study the effects of impaired in the photosynthetic on remobilization percentage of sorghum maturity groups were examined. Treatments were arranged in a split-plot design as randomized complete block with 6 genotypes of grain sorghum (including short-mid-and full-season genotypes) as main plot and 2 status of plant photosynthesis including not interfere with the photosynthetic (normal conditions) and impaired in the photosynthetic through dehydration of the leaves and green parts of plants using potassium iodide (KI) in three replications. The experiment was conducted at the Agriculture and Natural Resources Research Station of Toroq Northern Iran during 2010. The results showed that grain yield biological yield harvest index remobilization percent were significantly different across sorghum maturity groups. The greatest grain yield biological yield harvest index and number of grains per panicle were obtained at M5 genotypes (6104 kg ha-1 16010 kg ha-1 38% and 60 respectively). Highest remobilization percentage transferred of the 9early genotype of the 532 /5gr/m2 and the highest percentage remobilization and highest remobilization efficiency to the 2Genotype of mid groups and 9early groups the range respectively 39/99% and 69/08%. biological yield treatment of this non disorder in photosynthesis rate was 70% compared to the increased disorder. Correlation analysis that there was positive and significant correlation between dry matter remobilization accumulation with remobilization efficiency (P <0.01) r = 0.920) and percentage remobilization (P<0.01) r = 0.640).

Beheshti A.R.,Khorasan Agricultural and Natural Resource Research Center | fard B.B.,Islamic Azad University at Mashhad
Australian Journal of Crop Science | Year: 2010

A field experiment was conducted during growing season of 2007-2008 at Khorasan Agricultural and Natural Resource Research Center, Mashhad-Iran, to study dry matter accumulation and remobilization in grain sorghum genotypes under water stress and normal conditions. The main plots were allocated to two levels of moisture regimes, including water deficit after anthesis and normal condition (no water stress) and the subplots were disturbance photosynthesis with potassium iodide and non disturbance on current photosynthesis and three grain sorghum genotypes (Sepideh, M5 and M2 promising lines). The results showed that water stress significantly (p≤0.01) increased amounts of remobilized dry matter (ARDM), remobilization efficiency (REE), remobilization percentage (REP) by 11.21%, 32.37 % and 14.20%, respectively, compared with normal condition over all treatments. However it significantly (p≤0.05) decreased biological and grain yield. Disturbance in current photosynthesis caused 57.79 % and 21.20 % increase in remobilization percentage and remobilization efficiency compared to non disturbance status across all treatments. M5 genotype had the highest remobilization percentage and remobilization efficiency as compared with the two other genotypes in all experimental plots. The stepwise linear multiple regression indicated that grain yield would be properly predicted by biological yield and harvest index (R 2=0.99, p≤0.01).

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