Effect of adding perlite in soil on some growth and physiology characteristics of Queues castanifolia seedlings under water deficit stress

Abstract

Draught stress is the most important abiotic stress significantly affecting plants’ growth, development, and performance. This study was carried out to determine the effect of perlite, as a modifying element of soil, on growth and physiological responses of Queues castanifolia seedlings under water deficit stress. A factorial experiment was conducted as randomized complete block design under greenhouse condition of the Agricultural and Natural Resources Research Center in Gorgan, 2015. Perlite treatments at 4 levels (0, 15, , and 35% (V/V)) were added in soil and water stress at 3 levels (40, 70, and 100% irrigation at field capacity) were applied in the pot experiment for 5 months. Some parameters including gas exchange (photosynthesis, stomatal conduction, and transpiration), leaf water potential of seedlings, diameter and height growth, and dry weight of root, stem, leaf, and seedlings were measured in different treatments at the end of the experiment period. Results showed that all parameters were affected by different levels of irrigation and perlite. Water deficit by 40% FC reduced 51% and 68% of photosynthesis and stomatal conductance, respectively. The highest diameter and height growth and dry weight of the seedlings were observed in 25% and 35% (V/V) perlite application under normal and stress conditions, respectively. The use of perlite alleviated the negative effects of water deficit and ameliorated seedling growth. The findings suggest that perlite application in soil is suitable for the production of desirable seedlings under water deficit condition.

Keywords

• drought stress
• gas exchange
• leaf water potential
• nursery soil amendment