Enhance the allelopathic potential of two rice cultivar (Oryza sativa L.) by foliar application of salicylic acid under salinity stress

Abstract

In order to investigate the effect of salicylic acid under salinity stress as an allelopathy stimulator in rice cultivars a hydroponic and pot experiment was carried out in factorial arrangement. Rice cultivars (Tarom and Neda) were grown under different levels of salinity stress (0, 4dS/m and 8dS/m) until 5 leaf stage, also at the same time the salicylic acid was used as foliar (0, 1% and 2%). The root exudates were collected and used as a growth bio-inhibitor in barnayardgrass pot culture. The highest inhibitory effects on chlorophyll, leaf area, root and nitrogen contents of barnyardgrass was obtain when the SA (%2) + EC (4dS/m) treatment was used (with 38%, 60%, 38% and 37.5% inhibition, respectively). Also, chlorophyll content was closely correlated with nitrogen content. Therefore, it may be possible to recommend that, the foliar application of SA 2% will be suitable for better stand of rice seedlings and more allelopathic potential on barnyardgrass in moderate saline conditions of paddies.

Allelopathic Potential of Compounds in Selected Crops

“…Li et al (2010) observed inhibited root growth, damaged seed cell membrane systems for mitochondria and chloroplasts, increased cell permeability, and consequently reduced crop growth rates by allelochemicals from of seedlings of M. pruriens and other crop species. Esmaeili and Heidarzade (2015) indicated that rice root exudates recorded the greatest inhibitory effects on chlorophyll, leaf area, root growth, and nitrogen content. Hooper et al (2015) reported root exudates of D. uncinatum inhibited weed growth.…”

“…Inhibitory effects on germination and establishment of crops and weeds caused by crop residues have been reported (Zohaib et al, 2016;Ashraf et al, 2017). Effects on foliar enzyme activity, protein synthesis, photosynthesis, respiration, cell division and enlargement were observed by several researchers (Nishida et al, 2005;Cai & Mu, 2012;Esmaeili & Heidarzade, 2015), resulting in significant reductions in crop yields.…”