Effects of Spring Late Frost on Black Seed (Nigella sativa L.) under Controlled Conditions

پژوهشهای زراعی ایران

Article 9, Volume 12, Issue 4 - Serial Number 36, January 2015, Pages 665-676   

Document Type: Research Article

DOI: 10.22067/gsc.v12i4.45150

Authors

T Khorsandi; A Nezami^* ; M Kafi; M Goldani

Ferdowsi University of Mashhad

Abstract

In many years plant growth strongly affected by late spring frost. In order to evaluate the effects of late frost on Black Seed plants, a factorial experiment based on completely randomized design with three replications was carried out in college of agriculture, Ferdowsi University of Mashhad and five Black Seed ecotypes (Birjsnd, Sabzewar, Ferdows, Gonabad and Neyshabour) after two months growth and hardening in natural environment, were exposed to seven temperatures (0, -1.5, -3, -4.5, -6, -7.5 and -9°C) in termogradient freezer. For determining cold stress damages, Lethal Temperature (LT) for 50% of plants according to the Electrolyte Leakage percentage (LT50el), LT for 50% of plants according to the Survival percentage (LT50su), LT for 50% of plants according to the plant necrose in Test Tube (LT50tt) and Reduced Dry Matter Temperature 50 (RDMT50) were measured. Ability of plants for recovery was recorded based on leaf number and leaf area, plant dry weight and cold damage percentage of leaves. According to the LT50tt, LT50su and RDMT50 Black Seed plants can tolerated cold stress in range between -5.7 to -9.0 °C and Sabzewar and Ferdows ecotypes had the most and the least cold tolerance, respectively. At the point of ability of plants for recovery, Ferdows ecotype had the least and Sabzewar and Neyshabour ecotypes had the best plant recovery. Moreover there were high correlations between LT50tt and LT50 based on electrolyte leakage, survival and RDMT50. Electrolyte leakage and visual scoring of cold damage in test tube are rapid methods, so for assessing cold tolerance in plants LT50el and LT50tt indeces may be useful.

Keywords

Cold stress; Electrolytes leakage; Plant necrose; Recovery; Survival

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