Tolerancia de papas nativas (Solanum spp.) a heladas en el contexto de cambio climático
Morphological characters, tolerance to frost
With the objective of identifying varieties of native potatoes with tolerance to frost,research was carried out in three localities of the central highlands of Peru: Pahual andPaltarumi (Pariahuanca), Huancayo, and Huayllacancha (Yanacancha), Chupaca, Junín.The population consisting of 10 varieties was installed by completely randomized blockdesign. Morphological characters and frost severity were evaluated. The results show thatthe varieties that showed tolerance to frost in the three localities were Yana huancuy(Solanum chaucha), Chaulina (S. phureja), Huamantanga blue (S.chaucha), Camotillo andPeruanita (S. goniocalyx), which presented two layers of palisades of leaf parenchyma, verythick leaves with rough relief and purple stem. In number of stomata, Yana huancuy(Pahual), Chaulina (Paltarumi), Chaulina (Yanacancha) and Chaulina (Combined) stood outwith 7.25; 7.29; 7.18 and 7.22 stomata per optical field, respectively. In percentage ofseverity of the damage by frost, those of smaller damage were Chaulina (Pahual) andCamotillo (Paltarumi) with 14.81 and 14.57%, respectively. It is concluded that the frosttolerant varieties had two palisade layers of the parenchyma and greater thickness withrough relief in leaves, greater number of stomata and stems with purple pigmentation;these morphological characters consider in the genetic improvement of the potato.
Doris Marmolejo Gutarra, Jerson Eleazar Ruiz Velásquez
http://revistas.unitru.edu.pe/index.php/scientiaagrop/article/view/2085