Screening rice varieties for deep water tolerance [India]
1983
Radhakrishnan, R. | Vergara, B.S. (Tamil Nadu Agricultural Univ., Combatore (India). Crop Physiology Dept.)
Submerge tolerance scores indicated that only TNR 1, Dhanya, and Birpak had some degree of tolerance. Submergence tolerance, therefore, does not seem to be a crucial limiting factor for varietal development in deepwater. Salt tolerance - TNR 1, Ponkambi samba, Kattuvanan, Kar paddy, Dulai Baron, Kala or Black Aman, and Ponni showed tolerance equal to that of the check variety Pokkali. Elongation ability varied from 17 to 65 cm (25 to 129% increase). TNR 1 and Ponkambi samba had maximum elongation ability. Chingair and Birpak had more elongated internodes. Chingair, Birpak, Akulu, and Perunel had profuse modal roots, which increase plant nutrient uptake. TNR 1 and Birpak had the most pronounced kneeing ability. Sarapalli samba, Aeb 368 Rep P, and Gutak flowered at the 14 hour treatment, and were considered photoperiod insensitive. All other varieties were photoperiod sensitive and had relatively long basic vegetative phase
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