Malays. Appl. Biol. 1998 27(1 & 2): 25-31
INHERITANCE OF BACTERIAL WILT RESISTANCE IN LYCOPERSICON ESCULENTUM MILL.
SAAD OSMAN ABDALLA and HIRYATI ABDULLAH*
Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor Darul Ehsan, Malaysia
ABSTRACT
Experiments were conducted to evaluate the bacterial wilt resistance of six tomato parental lines (varieties) and the inheritance on three selected crosses. Greenhouse inoculation studies showed significant differences (P = 0.01) among genotypes, in their degree of susceptibility to bacterial wilt, as indicated by their disease indices. For the three crosses studied, resistance to bacterial wilt showed high heterosis over mid parental value and no heterosis over better parental value. Heritability estimates of disease index were generally high for all three crosses. This indicated that the additive genes were more important than non-additive genes. Therefore, in breeding programmes, selection for disease resistant plants (genotypes] after each generation of selfing is recommended.
ABSTRAK
Eksperimen telah dilakukan untuk menilai prestasi enam warisan induk tomato (varied) dan perwarisan pada tiga kacukan terpilih. Kajian inokulasi di rumah hijau menunjukkan induk mempunyai perbezaan yang bererti (P=0.01) antara genotip terhadap penyakit layu bakteria seperti yang ditunjukkan oleh indeks penyakit. Bagi tiga kacukan yang dikaji, kerintangan lerhadap penyakit layu bakteria menunjukkan heterosis yang tinggi pada nilai pertengahan induk dan tiada heterosis pada nilai induk terbaik. Anggaran keterwarisan pada umumnya adalah tinggi untuk kebanyakan ciri-ciri termasuk indeks penyakit. Ini menunjukkan pentingnya gen tambahan berbanding gen bukan tambahan. Oleh itu, di dalam program pembiakbakaan, disyorkan supaya pemilihan dilakukan untuk tanaman (genotip) rintang terhadap penyakit, selepas setiap generasi persenyawaan sendiri.
Key words: Bacterial wilt, resistance, inheritance, tomato
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