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Double-cross: a suitable method to improve Malaysian Eksotikas

机译:双重杂交:一种改进马来西亚Eksotikas的合适方法

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摘要

A double-cross method was applied to improve yield and fruit qualities, as well as storage life of Malaysian 'Eksotika' papayas. A non-indigenous papaya, 'PR217' was chosen as one of the parents to provide a wider genetic base. It has very small fruits (about 200 g per fruit), is a dwarf (0.5 m plant height at the first flowering stage) and has longer storage life compared to 'Eksotika'. Besides providing a wide genetic base, a double-cross method can enhance expression of heterosis. Two double-crosshybrids, i.e., [Eksotika II x (Line 19 x PR217)] and [(Sekaki x Line 20) x (Line 19 x PR217)] were generated and evaluated together with 'Eksotika', 'Eksotika' II and 'Line 19'. The double cross [Eksotika II x (Line 19 x PR217)] shows improved overall desirable traits compared to the other four genotypes. It has higher yield (34 kg plant1 year1), T.S.S. (13.6%) and longer shelf-life (6.3 days from Index 2 to 5 - eating stage) compared to 'Eksotika', 30 kg plant1 year1, TSS = 11.6% and 4.5 days, respectively. It also has better fruit appearance with minimal freckles on the skin compared to 'Eksotika*.
机译:采用双杂交法以提高马来西亚'Eksotika'木瓜的产量和果实品质以及贮藏寿命。非本土木瓜“ PR217”被选为亲本之一,以提供更广泛的遗传基础。它的果实很小(每个果实约200克),是矮小的(在开花的第一阶段植物高度为0.5 m时),与“ Eksotika”相比,具有更长的储存寿命。除了提供广泛的遗传基础,双杂交方法还可以增强杂种优势的表达。生成了两个双交叉杂交,即[Eksotika II x(19行x PR217)和[(Sekaki x 20行)x(19 x PR217行)],并与'Eksotika','Eksotika'II和'第19'行。与其他四种基因型相比,双杂交[Eksotika II x(19号线x PR217)显示出更好的总体理想性状。 T.S.S.产量更高(1年1年植株34公斤)。 ('Eksotika'),30千克植物1年1,TSS分别为11.6%和4.5天(13.6%)和更长的保质期(从索引2到5-进食阶段为6.3天)。与'Eksotika *'相比,它还具有更好的水果外观和最小的雀斑。

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