Efectos del anegamiento en invierno y verano sobre el crecimiento y la supervivencia de Lotus tenuis y Lotus corniculatus
Abstract
Tolerance to winter and summer waterlogging was expermentally studied in Lotus tenuis and Lotus corniculatus. Both legumes constitute an important forage resouce in the Flooding Pampa (Buenos Aires, Argentina), where L. tenuis occupies environments more exposed to flooding than L. corniculatus. Plants were cultivated individually in pots kept outdoors. Flooded plants were kept with a constant 3 cm water level above the soil surface, while controls were periodically watered. Plants were kept flooded until 75% of clorosis appeared on either species (42 days in the winter treatment and 17 days in the summer treatment). The winter treatment caused a decrease in aerial growth, leaf senescence, partial root decomposition and the formation of shoot hypertrophies, but no mortality. L. corniculatus was the most negatively affected species. Shoot hypertrophies were more abundant in L. tenuis. Weight recuperation after the winter waterlogging period was more rapid in L. tenuis than in L. corniculatus. The summer treatment caused high shot senescence in both species and no hypertrophy. After the waterlogging period, 50% of L. tenuis and 100% of L. corniculatus plants died. Regrowth of surviving L. tenuis plants was slow. The higher tolerance of L. tenuis to waterlogging agrees with the habitat segregation of both species observed infield studies.
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