CORRELATION AND PATH ANALYSIS OF HEAT STRESS TOLERANCE CHARACTERS IN POTATO (Solanum tuberosum L.)
Jajang Supriatna (a*); Ani Nuraeni (a); Resti Fajarfika (a), Juniarti P. Sahat (b)
a) Study Program of Agrotechnology, Faculty of Agriculture, Universitas Garut, Jl. Raya Samarang No.52A, Garut, Indonesia
*jajangsupriatna[at]uniga.ac.id
b) Indonesian Vegetable Research Institute, Jl. Tangkuban Parahu No. 517, Lembang, Indonesia
Abstract
Morphophysiological characters associated with yield in warm climate area can be used to determine heat stress tolerance characters. Simple correlation and path analysis were used to ascertain the relationship between morphophysiological characters and yield, and to estimate direct effects as well as indirect effects on them. Nine potato cultivars were evaluated in Garut, Indonesia which is situated at an altitude of 732 meters above sea level with an average temperature of 28oC. Randomized Block Design was used in this experiment and it was performed in triplicate. As the result, simple correlation indicated that plant height, leaf number, leaf size, stomata density, dry weight, tuber number, and tuber diameter showed positive significant relationship with yield, whereas chlorophyll content showed negative significant relationship with yield. Futhermore, path analysis indicated that leaf number had the highest positive direct effect on yield followed by plant height, and leaf size, whilst stomata density and dry weight had positive indirect effect on yield through tuber number. In conclusion, leaf number, plant height, and leaf size are the primary character, whereas stomata density and dry weight are the secondary character for selection the heat stress tolerance characters in order to develop high-yield potato cultivars in warm climate area.
Keywords: Correlation; Path Analysis; Heat Stress Tolerance; Potato
Topic: Biology