ความรุนแรงในการทำลายข้าวพันธุ์ต้านทานมาตรฐานและข้าวพันธุ์รับรองของเพลี้ยกระโดดสีน้ำตาล

Abstract

Objectives were to detect differences in damaging differential BPH resistant rice varieties and a set of certified rice varieties in major irrigated rice growing areas of Thailand. Thirty-four BPH populations were collected from 17 provinces of the upper central, central, lower northern, western and eastern regions. Mass rearing was conducted to obtain F3 and F4 generations. The differential set of BPH resistant rice varieties carrying different resistant gene were Mudgo (Bph1), ASD7 (bph2), Rathu Heenati (bph3), Babawee (bph4), ARC 10550 (bph5), Swarnalata (Bph6), T12 (bph7), Chin Saba (bph8), Pokkali-white (Bph9), Pokkali-black (Bph9) and IR65482-4-136-2-2 (Bph10). The set of certified rice varieties were PTT1, CNT1, SPR1, SPR3, SPR90, PSL2, RD31, RD23 and RD7, with a susceptible standard variety TN1. Seedling box screening techniques and standard evaluation system for rice were used to detect the reaction. Only 32 BPH populations were grouped by cluster analysis according to virulence reaction. Results indicated that when testing with the differential set of resistant varieties, at 0.16 coefficient, BPH populations could be identified into 9 different virulence BPH groups, and the differential set of BPH resistant varieties could be identified into 4 groups. Similarly, when testing with the set of certified rice varieties, at 0.175 coefficient, 6 groups of BPH and 3 groups of certified rice varieties could be classified according to the virulence reaction.