Analysing the SPAD dynamics of water-stressed vs. well-watered sesame ( Sesamum indicum L.) accessions and establishing their relationship with seed yield

The chlorophyll content is susceptible to deficit moisture stress and may affect the plant yield. Leaf chlorophyll content is directly related to tolerance and higher productivity under deficit moisture stress (WS). The SPAD meter is an excellent tool for rapid analysis of crop chlorophyll content....

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Published in:PeerJ (San Francisco, CA) CA), 2023-01, Vol.11, p.e14711-e14711, Article e14711
Main Authors: Pallavolu, Lora Anusha, Pasala, Ratnakumar, Kulasekaran, Ramesh, Pandey, Brij Bihari, Virupaksham, Umamahesh, Perika, Sandhyarani
Format: Article
Language:English
Subjects:
Agricultural production
Agricultural Science
Analysis
Cell division
Chlorophyll
Chlorophyll - analysis
Computer industry
Correlation analysis
Correlation and regression
Deficit moisture stress
Food, Water and Energy Nexus
Genotype
Genotypes
Leaves
Nitrogen
Physiological aspects
Physiology
Plant Science
Productivity
Regression analysis
Seed yield
Seeds
Seeds - chemistry
Sesame
Sesamum - genetics
Sesamum indicum
Soil Science
SPAD chlorophyll readings
Statistical analysis
Variance analysis
Water
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Summary:The chlorophyll content is susceptible to deficit moisture stress and may affect the plant yield. Leaf chlorophyll content is directly related to tolerance and higher productivity under deficit moisture stress (WS). The SPAD meter is an excellent tool for rapid analysis of crop chlorophyll content. Therefore, establishing a relationship between leaf chlorophyll content and seed yield is crucial in sesame, particularly under deficit moisture stress. Seeds of 37 sesame genotypes with checks were used in this study. These genotypes were mostly landraces, adapted to different agro-ecological zones in India. The selected genotypes were evaluated under well water (WW) and deficit moisture stress (WS) conditions. The SPAD readings were recorded ten (10) times each at every seven days intervals from the juvenile/first bud (30-35 days after sowing) to ripening/ physiological maturity (95-100 days after sowing) stage. This study aimed to identify the association between leaf SPAD readings (recorded at 7-days interval) and seed yield of sesame genotypes. The analysis of variance revealed the presence of significant variation in SPAD readings due to treatment (WW and WS), genotypes, and their interaction effects. The SPAD readings at all stages were positively correlated with seed yield in both WW and WS. High values of correlation coefficients were observed at 52 (r: 0.672) and 59 (r: 0.655) DAS under WS; whereas at 59 (r: 0.960), 66 (r: 0.972) and 73 (r: 0.974) DAS under WW at one percent significance level (  
ISSN:2167-8359
2167-8359
DOI:10.7717/peerj.14711