TY JOUR TI PHOTOSYNTHETIC PIGMENT CONTENT AS A CONSEQUENTAL RESISTANCE SIGN OF POTATO VARIETIES TO HIGH TEMPERATURE AND MOISTURE LACK KW potatoes KW heat resistance KW xerophytism KW pigments KW yield JO Bulletin Samara State Agricultural Academy AU Bakunov, A.L. AU Milekhin, A.V. AU Rubtsov, S.L. AU Shevchenko, S.N. PY 2020 IS 5 PB Samara State Agrarian University