2. Institutional Publications

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Subject: search.filters.subject.Piper nigrum L.

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    Influence of plant characters on yield in black pepper (Piper nigrum L.)
    (Kerala Agricultural University, 1995) Sujatha, R; Namboodiri, K M N
    Data on 580 genotypes of black pepper were .utilised to estimate the correlations among yield and 20 quantitative characters. The results revealed that the reproductive characters viz., green spike yield per vine, green berry yield per vine, number of spikes per vine and number of under-developed berries per spike as well as the vegetative characters, thickness of node and intemode of orthotrope and angle of insertion of plageotrope are positively and significantly correlated with yield. The inter-correlations among these characters were also positive and significant. Path analysis revealed positive direct effect on yield by the characters green berry yield, spike number, spike length and angle of insertion of plageotrope. The effect of the remaining characters on yield were due to their indirect influence through other component characters.
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    Heterosis in black pepper (Piper nigrum L.)
    (Kerala Agricultural University, 1995) Sujatha, R; Namboodiri, K M N
    A study was conducted to estimate heterosis in F, hybrids of black pepper with respect to yield and three reproductive characters using 45 hybrids belonging to eight different intervarietaJ combinations of crosses planted at the Pepper Research Station, Panniyur. One of the hybrids, viz. Culture 4968 belonging to the cross Uthirenkotta x Balankotta was found to exhibit high heterosis with respect to all the characters. Promising parental combinations were, Uthirenkotta x Cheriyakaniakkadan and Karivilanchy x Cheriyakaniakkadan. The combinations Uthirenkotta x Kottanadan, Uthirenkotta x Kuthiravaly and Panniyur 1 x Karimunda were found least promising.
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    Screening of black pepper (Piper nigrum L.) calliclones for phytophthora foot rot resistance / tolerance
    (Kerala Agricultural University, 1996) Shylaja, M R; Sreekandan Nair, G; James Mathew
    Calliclones of different black pepper cultivars viz., Kalluvally, Cheriakanyakkadan, Balankotta, Karimunda and Panniyur-1 were regenerated from calli, screened against toxic metabolite(s) of Phytophthora capsici. The regenerants derived from screened and unscreened calli were further tested for resistance / tolerance to P. capsici using different methods of screening viz., natural screening (keeping in infected field), screening by electrolyte leakage method and screening by artificial inoculation with culture disc of P. capsici. None of the regenerated calliclones was found to be completely resistant to the disease in natural screening. However, some of the regenerants derived from unscreened calli exhibited higher degree of tolerance to the disease revealing the possibility of exploiting somaclonal variation for Phytophthora foot rot disease screening in black pepper. The calliclones of Cheriakanyakkadan recorded greater degree of tolerance to the disease as compared to others.