Open AccessINFLUENCE OF CALCIUM CARBONATE AND KAOLIN ON GROWTH, DROUGHT RESISTANCE INDEX AND PHYSIOLOGICAL TRAITS OF PAULOWNIA (PAULOWNIA TOMENTOSA, THUNB.) SEEDLINGS UNDER DROUGHT STRESS CONDITIONS
Author(s) -
Marwa E. Mohamad,
A.A. Awad,
A. S. Gendy
Publication year - 2021
Publication title -
plant archives/plant archives
Language(s) - English
Resource type - Journals
eISSN - 2581-6063
pISSN - 0972-5210
DOI - 10.51470/plantarchives.2021.v21.no1.092
Subject(s) - paulownia , distilled water , horticulture , irrigation , stomatal conductance , water content , proline , field capacity , drought stress , botany , agronomy , biology , chemistry , photosynthesis , biochemistry , geotechnical engineering , amino acid , chromatography , engineering
Two pot experiments were carried out at lath house in the Nursery of Ornamental Plants, Hort. Dept., Zagazig Univ., Egyptduring the two spring consecutive seasons of 2018/2019 and 2019/2020 to study the effect of water stress (irrigation at 100,75 and 50 % from field capacity), antioxidants type [(distilled water as control, 4 g/l of calcium carbonate (CC) and 30 g/l ofkaolin (Ka)] as foliar applications and their interaction treatments on growth parameters, physiological traits, drought resistance percentage and some chemical constituents of paulownia seedlings. Plant height, stem diameter, leaf number per plant,dry weight of leaves per plant, drought resistance index, wood density and total chlorophyll content decreased significantlywith increasing drought treatments from 100% to 50 % field capacity. However, water stress significantly increased solublesugar content and proline content in leaves compared to full irrigation treatment. Furthermore, using each calcium carbonateor kaolin significantly increased all abovementioned parameters compared to control (sprayed with distilled water) in bothseasons. Generally, it could conclude that 30g/l Ka showed a uniform influence in alleviating of Paulownia tomentosa growthinhibition and its wood density under moderate water stress condition with increasing in drought resistance percentage to reach105.68 and 102.09 % in the first and second seasons, respectively.