(L.) G. Don is a vital summer season perennial semi shrub and multipurpose drought resilient flower crop of the tropical region of the Indian subcontinent. This industrially dominant crop is primarily availed as border, bedding and pot culture in landscaping; and also cultivated for its anti-cancer alkaloid compounds enriched plant parts. Hence, the present study was focused to explore diversity. Six inbred lines of periwinkle were crossed in full-diallel fashion with an objective of identifying superior cross-combinations for high general, specific and reciprocal combining ability. The analysis of variance for combining ability was highly significant for growth and flowering traits indicated existence of both additive and non-additive gene actions. However some traits showed only additive effect due to non-significant general combining ability. The parental lines of Vi-13–2 and Vi-15–2 expressed superior general combining effects for flower yield and considered as good general combiners for crossing programmes. The cross combinations Vi-15–1 × Vi-14–3 and Vi-16 × Vi-15–2 exhibited significantly positive specific combining ability effects for flower yield and considered as good specific direct combiners. High specific direct cross combiners necessitate poor × good, good × good and poor × poor parental combinations and can be contribute additive × dominance, additive × additive, dominance × dominance and epistatic gene interactions. The specific reciprocal cross combiners identified as Vi-14–3 × Vi-29 and Vi-14–3 × Vi-13–2 with superior expression in the reciprocal magnitudes for various traits might be due to cytoplasmic effects. The current investigation is designed to identify the best performing inbred lines for ornamental utilization as well as lines that can be exploited as parents in subsequent crosses.

中文翻译：

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通过双列分析评估长春花（Catharanthusroseus（L.）G.Don）目标性状的配合力

(L.) G. Don 是印度次大陆热带地区重要的夏季多年生半灌木和多用途耐旱花卉作物。这种工业主导作物主要用作园林绿化中的花坛、花坛和盆栽；也因其富含抗癌生物碱化合物的植物部分而被栽培。因此，本研究的重点是探索多样性。以全双列方式对长春花的六个自交系进行杂交，目的是鉴定具有高通用、特异和互惠配合能力的优良杂交组合。配合力的方差分析对于生长和开花性状非常显着，表明加性和非加性基因作用的存在。但有些性状由于一般配合力不显着，仅表现出加性效应。 Vi-13-2 和 Vi-15-2 的亲本系对花产量表现出优异的一般配合效果，并被认为是杂交计划的良好通用配合系。杂交组合Vi-15-1×Vi-14-3和Vi-16×Vi-15-2对花产量表现出显着的正特异性结合力效应，被认为是良好的特异性直接结合子。高特异性直接交叉组合需要差×好、好×好和差×差亲本组合，并且可以贡献加性×显性、加性×加性、显性×显性和上位基因相互作用。被鉴定为 Vi-14–3 × Vi-29 和 Vi-14–3 × Vi-13–2 的特定互反交叉组合子在各种性状的倒数幅度中具有优异的表达，可能是由于细胞质效应。目前的调查旨在确定用于观赏用途的表现最佳的自交系以及可在后续杂交中用作亲本的系。