Uji Toleransi Tanaman Kentang Hitam (Plectranthus rotundifolius (Poir.) Spreng.) Hasil Radiasi Sinar Gamma terhadap Cekaman Kekeringan

Abstract

Plectranthus rotundifolius (Poir.) Spreng. is one of the potential root crops to become an alternative food. The aim of this
study was to determine drought resistant status of Plectranthus rotundifolius irradiated by gamma irradiation. This
experiment was conducted in the Green House using a Completely Randomized Design with 2 factors and 5 replications.
The first factor was plant number consisted of 7 accessions (D116, D69, M343, D40, M95, D3, and Klefa Imut/KI). The
second factor was the level of field capacity (FC) consisted of 100% FC, 60% FC, and 20% FC. The observed parameter
were vegetative and generative growth stage, stomatal conductance, leaf water potential, and chlorophyll content. The result
showed that the resistance level of the 7 accessions can be devided into 3 categories: 1) The plants that were susceptible to
drought i.e. D116, D69, M343, and KI; 2) The plants that were semi-tolerant to drought i.e. D40 and M95; and 3) The plant
that was tolerant to drought i.e. D3.
Keywords: Plectranthus rotundifolius, gamma irradiation, drought stress