Ultrastructural response of wheat (Triticum aestivum L.) lines to potential allelopathy of Alstonia scholaris (L.) R. Br. leaf extract

Authors : Mansoor HAMEED, Sana FATİMA, Farooq AHMAD, Muhammad ASHRAF, Maryam MARYAM, Muhammad Sajid Aqeel AHMAD, Iftikhar AHMAD, Ummar IQBAL

Pages : 509-525

View : 18 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :An investigation was carried out to evaluate the impact of the allelopathic effect of Alstonia scholaris leaf extract on morphoanatomical and physiological characteristics of 5 wheat lines. Three extract dilutions were prepared, viz. 0 insert ignore into journalissuearticles values(control);, 15 and 30% of the aqueous extract and sprayed on wheat lines insert ignore into journalissuearticles values(3094, 5066, M5082, 7076 and A2011); at 15-day intervals until maturity from November 2017 to May 2018. All wheat lines responded differently to an allelochemical extract of A. scholaris. Disintegration of root parenchyma and transformation of stem chlorenchyma to sclerenchyma in stems were noted in Line 3094. Increased sclerification in the root cortex insert ignore into journalissuearticles values(141.7-212.5 mu m); and stem hypodermal region insert ignore into journalissuearticles values(212.5-354.2 mu m); was recorded in Line 5066. Line M5082 showed intensive sclerification in the root cortex and vascular region, and around stem vascular bundles along with a significant decrease in leaf thickness. Line 7076 was the most sensitive genotype showing significant reduction in the stem insert ignore into journalissuearticles values(1402.8-821.8 mu m); and root area insert ignore into journalissuearticles values(963.5791.9 mu m); and leaf thickness insert ignore into journalissuearticles values(1346.2-396.8 mu m);. Line A2011 responded very differently by increasing proportion of parenchyma and sclerenchyma. A low concentration insert ignore into journalissuearticles values(15%); of allelochemical extract promoted growth and development and a high concentration insert ignore into journalissuearticles values(30%); was toxic, causing growth retardation and tissue damage.
Keywords : Chlorenchyma, devil tree, leaf thickness, parenchyma, sclerenchyma