Effect of temperature and red light on Potamogeton crispus L. buds of turion types.

Abstract: The pond weed Potamogeton crispus L. produces turions. In Egypt, turions are classified into 3 types according to their position of formation (apical, lateral-apical and lateral). The effect of temperature on turion types was stutied under laboratory conditions. The best sprouting occurred under 15 ˚C, but sprouting was inhibited under 5 and 30 ˚C for all turion types in both light and dark. Lateral turions gave the highest percentage of sprouting at all tested temperatures. Turions lost their viability when submerged at 60 ˚C for 30 minutes. The seedlings which were formed from lateral turions decayed faster than those formed from apical and lateral-apical. Seedlings under 30 and 50 ˚C decayed after 20 and 6 days, respectively.
Under field coditions, temperature ranged from 34 to 38 ˚C during July, August and September, 1999 and 2000. The effect of red light on turions was studied. Red light induced the dormant buds to sprout and the high temperature killed the sprouts. The living sprouts percentage for both seasons studied was 5.1 , 12.2 18.4 %, meanwhile, the decayed ones were 16.8 , 28 and 43.3 % during July, August and September, respectively.
Publication year 2001
Pages 367 – 384
Organization Name
serial title Bull. Fac. Agric., Cairo Univ.
Author(s) from ARC
AGROVOC
TERMS		 Sprouting. Temperature.
Proposed Agrovoc Potamogeton crispus L.;red light;turion types;
Publication Type Journal
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