2. Institutional Publications
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Item National agricultural research project in Kerala(Kerala Agricultural University, Vellanikkara, 1995) Mohanakumaran, NItem Effect of growth regulators on the yield of tomatoes(Kerala Agricultural University, 1974) Manikantan Nair, P; Mohanakumaran, N; Ramachandran Nair, VItem Heterosis in chilli (Capsicum annum L.)(Kerala Agricultural University, 1986) Manikantan Nair, P; Mary K George; Mohanakumaran, NAn experiment was laid out in 1979 at the Department of Agricultural Botany, College of Agriculture, Vellayani to study the heterosis in Capsicum annum L. Nine parents and 36 F1 hybrids were compared. Eighteen economic attributes including vitamin A, vitamin C, capsaicin and oleoresin content were studied. All the characters under investigation manifested heterosis over midparental values though there was wide variation for different traits in different cross combinations. Maximum heterosis was noticed for number of primary bradches and vitamin C content. A comparison of average heterosis for various characters revealed that number of secondary branches topped the list followed by vitamin C, capsaicin content and number of primary branches. The studies identified two promising hybrids with desirable attributes namely Purple Round x Vellanotchi and Pant C1 x Purple Cluster. Negative heterosis was noticed for two important economic attributes namely number of days taken for blooming and number of seeds per fruit. For nutritive and quality characters very little expression of hybrid vigour in vitamin A content was noticed. However, there was considerable manifestation of hybrid vigour in vitamin C and oleoresin content.Item Device for bagging cocoa flowers(Kerala Agricultural University, 1987) Rajamony, L; Mohanakumaran, NItem Effect of N, P and K on the growth of Costus speciosus (Koening) Smith(Kerala Agricultural University, 1987) Sudhadevi, P K; Mohanakumaran, NA field trial was conducted to find out the role of major nutrients on different growth characters of Costus speciosus and the important characters which had a bearing on diosgenin yield were identified. The results showed that N application increased the growth of plants in terms of height, length and breadth of leaves, area per leaf and total leaf area per plant. P had a depressing effect, especially on the number of leaves and area per leaf. The beneficial effect of K was only marginal, as compared to that of N. Application of N increased the yield of rhizomes. The diosgenin content of the rhizomes was found to be significantly influenced by N, P and K application while the yield of diosgenin was significantly influenced by different levels of N and K. Of the growth characters studied, the total leaf area and plant height were found to be significantly correlated with diosgenin yield.Item Effect of plant growth substances on the in vitro propagation of jack (Artocarpus Heterophyllus Lam.)(Kerala Agricultural University, 1988) Rajmohan, K; Mohanakumaran, NExplants from shoot apices of fresh stem sprouts of five-year old jack (Artocarpusheterophyllus Lam.) trees registered a multiplication rate of 4.5 x. when cultured for five weeks on MS proliferation medium containing BA (5 mg/l) and NAA (0.2 mg/l). The normal strength of inorganic salts and organic growth factors of the MS medium, with 30—40 g/l of sucrose or 20—30 g/l of glucose was found to support the multiplication and growth of the cultures. GAa did not influence the shoot proliferation or growth. Adenine sulphate at 20 mg/l was found to increase the multiplication rate by 27.3 per cent, withoutItem Somatic organogenesis/embryogenesis from in vitro cultures of mussaenda (Mussaenda Erythrophylla Schum & Thonn.)(Kerala Agricultural University, 1988) Rajmohan, K; Mohanakumaran, NOvary wall was identified as the best source of explantfor callus production, registering a callus index value of 400, when cultured on MS medium supplemented with NAA 2 mg/l+ kinetin 1 mg/I or NAA 4 mg/l + kinetin 2 mg/l. Shoot regeneration from the callus occurred at a frequency of 33.3 per cent on MS medium supplemented with BA 2 mg/l or BA/kinetin combinations 0.5 + 0.5 mg/l or 0.5 + 0.3 mg/1. Root regeneration was observed at a frequency of 66.7 per cent, with 13.33 roots per culture on MS medium containing kinetin NAA combination 2+8 mg/l after 60 days of culture. Globular structures resembling somatic embryoids having simultaneous root and shoot development were observed when callus from tha induction medium (MS •+• 2,4-D 2 mg/l -f kinetin 1 mg/l) was transferred to MS medium containing BA/kinetin combinations 0.5 4- 0.5 mg/l or 1 + 0.5 mg/l, after 70 to 73 days of culture. About 4.5 shoots with tufts of miniature roots were formed per culture in the best treatment.Item In vitro rooting of jack shoot cultures(Kerala Agricultural University, 1983) Rajmohan, K; Mohanakumaran, NItem Standardisation of leaf sampling technique in cocoa seedling(Kerala Agricultural University, 1990) Salikutty Joseph; Mohanakumaran, NItem Effect of ethrel, 2,4-D and MH on growth, rhizome yield and diosgenin content in costus spec/os us (Koening) smith(Kerala Agricultural University, 1994) Satheeshan, K N; Mohanakumaran, NAn experiment to study the effect of ethrel, 2,4-D and MH on the growth, rhizome yield and diosgenin content in Costus speciosus was conducted at the College of Horticulture, Vellanikkara. Plant height was significantly reduced by ethrel and MM at the levels tried. Ethrel 100 and 200 ppm significantly increased the number of tillers per plant. The length, width and leaf area and internodal length of shoot was significantly reduced by ethrel treatments while total leaf area was higher in plants treated with 2,4-D (10 and 20 ppm). Ethrel 200 ppm recorded maximum yield of green and dry rhizomes. Diosgenin content of the rhizome was found to be the highest in the plants treated with 2,4-D 10 ppm. Shoot/rhizome ratio was significantly reduced by Ml I treatments.