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G. Hemalatha ¹, P. Paramaguru ¹, V. Ponnuswamy ¹

Affiliations
1 Department of Horticulture, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Killikulam, Vallanad - 628 252, IN

Abstract

Guava (Psidium guajava), the apple of the tropics is the fourth most important fruit in India, after mango, banana and citrus. It is highly nutritious, rich in ascorbic acid and minerals. A guava contains more than five times as much vitamin C as orange. The flesh and seeds are also useful source of pectin. Efforts are underway in many guava producing countries to develop new guava varieties suitable for processing, high yield and quality fruits, both for domestic and export markets. The present study thus aims at studying the physico-chemical characteristics of selected guava cultivars so as to aid in horticultural breeding.

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M. Velmurugan ¹, K. Rajamani ¹, P. Paramaguru ¹, R. Gnanam ², J. R. Kannan Bapu ³

Affiliations
1 Department of Spices, Plantation Crops and Medicinal Plant Unit, Tamil Nadu Agricultural University, Coimbatore – 641 003, IN
2 Agricultural College and Research Institute, Madurai, IN
3 Agricultural Research Station, Aliyarnagar, IN

Abstract

The present investigation was carried out during 2003-2007 involving terminal cuttings of coleus ecotype 'Garmai'. Genotypic correlation coefficient between yield and its components in mutants of coleus was studied, viz., plant height, number of branches plant^-1, number of leaves plant^-1, number of tubers plant^-1, tuber length and tuber girth were found to have positive and highly significant correlation with yield. However, forskolin and essential oil content showed negative correlation with yield. Path analysis of component characters on yield of Coleus in V₂M₁ generation exerted positive direct effect through the characters plant height, number of leaves plant^-1 and number of tubers plant^-1. Similarly, direct effect was observed to be negative through number of branches plant^-1 (-0.930), total amount of alkaloids (-0.066) and forskolin content (-0.026). The current investigation resulted in residual effect of 0.158 indicating the accuracy and appropriate selection of component character for crop improvement programme. Weightage must be given to component characters exhibiting positive attributes towards fresh tuber yield in Coleus. However, some traits with negative attributes are also chosen for getting improved quality, i.e., forskolin content, without much inhibition on fresh tuber yield plant^-1.

Keywords

Coleus forskohlii, Correlation, Path Analysis.

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J. E. Adeline Vinila ¹, P. Paramaguru ¹, G. Vaidehi ¹

Affiliations
1 Horticultural College and Research Institute, Coimbatore (T.N.), IN

Abstract

A field experiment was carried out to screen the coriander germ plasm for germination studies at Horticultural College and Research Institute, TNAU, Coimbatore. Preliminary screening was done with 240 accessions and 50 accessions were selected based on yield performance along with check CO (Cr) 4 and the seeds were sown in pots. The experiment was carried out with three replications in Randomized Block Design. Germination percentage, Height of the seedlings, Root Length and Vigour index were maximum in accession (ACC 18) compared to check.

Keywords

Coriander, Germination, Vigour.

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