Reference "Categories and inheritance of resistance to Nilaparvata lugens (Hemiptera: Delphacidae) in mutants of indica rice 'IR64'"

Reference ID

27404

Title

Categories and inheritance of resistance to Nilaparvata lugens (Hemiptera: Delphacidae) in mutants of indica rice 'IR64'

Source

Journal of economic entomology, 2008, vol. 101, pp. 575-583

Authors (7)

Sangha-J-S	Chen-Y-H
Palchamy-K	Jahn-G-C
Maheswaran-M	Adalla-C-B
Leung-H

Abstract

Varietal mutants can be useful for developing durable resistance, understanding
categories of resistance, and identifying candidate genes involved in defense
responses. We used mutants of rice 'IR64' to isolate new sources of resistance
to the planthopper Nilaparvata lugens (Stal) (Hemiptera: Delphacidae). We
compared two mutants that showed a gain and loss of resistance to N. lugens, to
determine the categories of resistance to this pest. Under choice tests, female
planthoppers avoided settling and laid fewer eggs on the resistant mutant 'D518'
than on the susceptible mutant D1131, susceptible check 'TN1', and wild-type
IR64, indicating that antixenosis was the resistance category. Similarly, under
no-choice conditions, planthoppers laid 29% fewer eggs in D518 than in IR64, but
they oviposited more in 'D1131' and TN1. Honeydew excretion was greater on D1131
seedlings but slightly lower on D518 than on IR64. Nymphal survival and adult
female weight did not differ among rice cultivars. D518 showed higher tolerance
of N. lugens infestations than IR64. Genetic analysis of the F1, F2, and F3
populations derived from D518 x IR64 revealed that resistance in D518 is
dominant and controlled by a single gene. Despite the variation in resistance to
N. lugens, both mutants and IR64 performed similarly in the field. The mutant
D518 is a new source of durable resistance to N. lugens, mainly due to enhanced
antixenosis to female hoppers for settling and oviposition.