Impact of water deficit stress on biomass production of different gladiolus cultivars under rainfed condition

Ranjan Das, Kaushik Bhagawati, Alpana Boro, Tulika Medhi

doi:10.25081/jfcls.2015.v1.2806

Ranjan Das, Kaushik Bhagawati, Alpana Boro, Tulika Medhi

Open Access

https://doi.org/10.25081/jfcls.2015.v1.2806

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Abstract

Among the environmental stresses, water deficit stress was recognized to be one of the most adverse factors for plant growth and productivity. The study aimed to comparatively evaluate impact of water deficit stress on biomass of seven cultivars of gladiolus in terms of leaf area duration and net assimilation rate under rainfed conditions in northeastern region of India. Also, productions in terms of marketable spikes were compared. The parameters were measured using standard procedures. Comparatively higher leaf area duration (116 days) and net assimilation rate were found in cultivars Aarti (116 days and1.62 gcm-2day-1x10-3 respectively) and Suchitra (98.0 days and 1.10 gcm-2day-1x10-3) which account for their higher biomass production with larger spike size with good numbers of flowers. The highest marketable spikes (71111.11 spikes ha-1) was found in cultivar Aarti followed by Suchitra (68148.14 spikes ha-1) which might be due to its comparatively higher biomass production and less deviation, during stress condition, from normal characteristics. The tolerant cultivars are those that can adapt to the change without much change in their normal growth. And the responses of those species are commercially acceptable that promote adaptation without compromising much with the plant growth and crop production.

Highlights

Stress may be defined as the altered physiological condition caused by environmental factors that tends to alter equilibrium (Shao et al, 2008)
Morphological and anatomical changes to increase its tolerance toward adverse environmental conditions. Those species can be regarded as economically tolerant that deviate minimum from its normal growth and performance.The common adverse effect of water stress on the plant is a reduction of biomass production (Zhao et al, 2008)
net assimilation rate (NAR) had considerable variations among the cultivars (Figure 2), with highest NAR value in cultivar Aarti (1.62 g/cm/day × 10−3) followed by Suchitra (1.10 g/cm2/day× 10−3).While NAR value was found to be lowest in the cultivar Apollo (0.54 g/cm2/day×10−3) followed by Jacksonville Gold (0.81 g/cm2/day× 10−3) (Table 2).The NAR value ofApollo and Suchitra was found to be significantly higher than rest of the cultivars

Summary

Introduction

Stress may be defined as the altered physiological condition caused by environmental factors that tends to alter equilibrium (Shao et al, 2008). Morphological and anatomical changes to increase its tolerance toward adverse environmental conditions Those species can be regarded as economically tolerant that deviate minimum from its normal growth and performance.The common adverse effect of water stress on the plant is a reduction of biomass production (Zhao et al, 2008). Morphological parameters such as fresh weight and dry weight have a profound effect in water-limited conditions (Shao et al, 2008). The climatic variation causes water deficit condition during growing season due to erratic

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