International Journal of Plant Sciences

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Chlorophyll Stability Index:A Rapid Method of Screening Chilli Accessions to Drought Under Tropical Conditions


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1 Department of Vegetable Crops, Horticulture College and Research Institute, Tamil Nadu Agricultural University, Coimbatore (T.N.), India
     

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Chilli is one of the important spices as well as vegetable crops of India and worldwide, which is predominantly grown as a rainfed crop in southern states of India, but now-a-days there is a drastic rise in temperature which affects the availability of water for irrigation. Chlorophyll plays a vital role in photosynthesis. But, they are highly thermosensitive in nature and degradation occurs when subjected to high temperature. So, for this changing environment there is anurgent need breed heat tolerant varieties. Chlorophyll stability index (CSI) is a function of temperature and is inversely related to the degree of stress conditions imposed on the plants. So the stability of chlorophyll pigments can be correlated with drought tolerance. So, CSI can be a rapid screening method of chilli genotypes for drought tolerance or susceptibility. We observed that, among genotypes used in the study M106 showed higher mean CSI value of 88.41 per cent followed by F02 (86.56%) and M08 showed least CSI value of 42.47 per cent. We can deduce that,M 106 can be used infuture breeding programmes for evolving drought tolerant chilli varieties, so that we can bring more acreage under chilli cultivation under rain fed cultivation in India.

Keywords

Chlorophyll Stability Index, Rapid Method, Screening Chilli Accessions.
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  • Chlorophyll Stability Index:A Rapid Method of Screening Chilli Accessions to Drought Under Tropical Conditions

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Authors

K. Arjun
Department of Vegetable Crops, Horticulture College and Research Institute, Tamil Nadu Agricultural University, Coimbatore (T.N.), India

Abstract


Chilli is one of the important spices as well as vegetable crops of India and worldwide, which is predominantly grown as a rainfed crop in southern states of India, but now-a-days there is a drastic rise in temperature which affects the availability of water for irrigation. Chlorophyll plays a vital role in photosynthesis. But, they are highly thermosensitive in nature and degradation occurs when subjected to high temperature. So, for this changing environment there is anurgent need breed heat tolerant varieties. Chlorophyll stability index (CSI) is a function of temperature and is inversely related to the degree of stress conditions imposed on the plants. So the stability of chlorophyll pigments can be correlated with drought tolerance. So, CSI can be a rapid screening method of chilli genotypes for drought tolerance or susceptibility. We observed that, among genotypes used in the study M106 showed higher mean CSI value of 88.41 per cent followed by F02 (86.56%) and M08 showed least CSI value of 42.47 per cent. We can deduce that,M 106 can be used infuture breeding programmes for evolving drought tolerant chilli varieties, so that we can bring more acreage under chilli cultivation under rain fed cultivation in India.

Keywords


Chlorophyll Stability Index, Rapid Method, Screening Chilli Accessions.

References