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Universidad Nacional Agraria La Molina (2020)

Reacción al calor y a sequía en papas nativas (Solanum spp.) cultivadas en Huánuco

Vidal Figueroa, Mario Antonio

Titre : Reacción al calor y a sequía en papas nativas (Solanum spp.) cultivadas en Huánuco

Auteur : Vidal Figueroa, Mario Antonio

Université de soutenance : Universidad Nacional Agraria La Molina

Grade : Ingeniero Agrónomo 2020

The imbalance of the amount of greenhouse gases in the atmosphere has raised temperature levels contributing to global warming, causing alterations in climatic conditions and affecting plants in their vital functions. Being the potato one of the most important crops worldwide and in turn being within the group of plants sensitive to these environmental changes, its study is of importance. With these considerations, an evaluation cycle of reaction to heat of plants from cuttings of 98 samples sown in the field of the Universidad Nacional Agraria La Molina was carried out in the months of September 2017 to March 2018, evaluating the survival percentage and identifying differences and responses in morphological indicators. There is a high mortality rate in plants due to a marked susceptibility to high temperatures accompanied by a high incidence and severity of pests and diseases. However, the Yuracc piña (BGR 254) and Wacash (BGR 285) morphotypes were found to be the most tolerant. Furthermore, in the Instituto Regional de Desarrollo de la UNALM (San Lorenzo, Jauja, 3250 masl), a preliminary screening of the reaction to drought of 69 morphotypes of native potatoes was carried out in which differences in morphological indicators of growth, development and production of tubers were evaluated in response to treatments of continuous irrigation (RC) and restricted irrigation (RR). In each cycle or period, 02 or 03 plants were watered every 1-2 days (RC) with the same amount of water per pot and the other 03 were watered every 5 days (RR), when they showed symptoms of drought stress. The mean difference was significant only in the variables dry foliage weight and stem thickness in the morphotypes subjected to RR and RC. However, those morphotypes that under RR conditions present higher averages than those under CR are highlighted. The yield components present a positive correlation and a significant reduction is evidenced in both under restricted irrigation. However, those morphotypes that even under adverse drought conditions showed higher averages stand out. Among those tolerant to drought are BGR 19 (´Rayhuana´) ; the BGR 99 (´Yuracc ñahui hualash´) ; the BGR 170 (´Yana utcush´) ; and the BGR 238 (´Muru


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