By Dham Pal Singh
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Extra resources for Breeding for resistance to diseases and insect pests
The natural resistance of soybean flour to Trogoderma granarium is mainly due to two factors, namely heat-labile inhibitor and nutritional deficiency (Chaudhary and Bhattacharya 1982). Such induced resistance may be useful, but should not be confused with inherent differences in resistance between cultivars or plants. c) Escape. This refers to the lack of infestation or injury to the host plant because of such transitory circumstances as incomplete infestation. Thus, finding an uninfested plant in a susceptible population does not necessarily mean that it is resistant.
A reduced horizontal pathogenicity has an effect identical to an increased HR: there is less disease. e) Cytoplasmic Resistance. The cytoplasm and its organelles play an important role in heredity. Nagaich et al. (1968) reported that the inheritance of symptoms of potato mosaic virus X infection in the interspecific hybrids of Capsicum species is controlled by the cytoplasm of the female parent. The two species C annuum and C pendulum differ in showing, respectively, a systematic mosaic and necrotic local reaction after leaf inoculation.
They found that increased calcification of cell walls and increased thickness were important in 3-weeks-old red kidney bean plants. A waxy cuticle may also limit exudation of the nutrients etc. required by the pathogens in the initial stages of infection and, therefore, may indirectly contribute to the defense of the plant. T. Martin 1964). b) The Epidennal Layer. The epidermis is the outer and primary layer of stems, roots, leaves etc. and includes waxes and cuticle and appendages like trichomes on the aerial parts and root hairs.