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Journal Cover Journal of Plant Breeding and Genetics
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  This is an Open Access Journal Open Access journal
   ISSN (Print) 2308-121X - ISSN (Online) 2305-297X
   Published by eSci Journals Publishing Homepage  [8 journals]
  • THE NORTHERN MAIZE LEAF BLIGHT DISEASE IN TANZANIA: REASONS AND REISSUANCE
           METHODS

    • Authors: Tulole L. Bucheyeki, Pangirayi Tongoona, John Derera, Suzan Nchimbi-Msolla
      Pages: 91 - 100
      Abstract: The northern leaf blight disease occurrence, intensity, distribution and resurgence in Tanzania have signalled attention to maize breeders. A clear understanding of its disease genetics, mode of gene actions and heritability plays significant roles in the successful designing breeding strategies and control. Gene actions and heritability provides information on choosing the appropriate breeding methods to be employed.  Therefore, this review aimed at bridging the disease genetics information and the practical application of breeding methods to be employed by breeders in fields. Information gathered here are important tools to breeders for selection of the best breeding methods that are used to impart resistance to northern leaf blight disease in maize.
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 3 (2017)
       
  • YIELD STABILITY OF COTTON GENOTYPES AT THREE DIVERSE AGRO-ECOLOGIES OF
           UGANDA

    • Authors: Martin Orawu, Gladys Amoding, Lastus Serunjogi, George Ogwang, Chris Ogwang
      Pages: 101 - 114
      Abstract: Yield and fibre qualities are economically important parameters considered by the majority of stakeholders engaged in the cotton value chain in Uganda. The study objective was to determine the stability and adaptability of advanced cotton lines in diverse agro-ecological zones. Yield potential and fibre traits of cotton genotypes were evaluated in cotton growing agro-ecologies of Uganda. Sixteen genotypes were evaluated for two-year cycles of 2013/2014 and 2014/2015 in Arua, Lira and Serere districts. Additive main effects and multiplicative interaction (AMMI) and genotype main effects and genotype by environment interaction (GGE) biplots determined the stability of genotypes for seed cotton yield in different environments. Significant differences were observed among genotype performances for all the traits assessed with exception of ginning out turn. Some genotypes showed good fibre traits and high seed cotton yield across sites in the two-year cycles. The mean yield across sites and years ranged from 1422 to 1883kg/ha with eight genotypes including the check (BPA2002), attained yield above the overall mean of 1729kg/ha. Five genotypes BTAM(13)MO.2 (1883kg/ha), MS(13)MO.1 (1838kg/ha), EZAMMAR(13)MO.1 (1839kg/ha), BTAM(13)MO.3 (1824kg/ha) and BHG(13)MO.2 (1818kg) had higher yield than the check (1777kg/ha). Using AMMI model, the genotype and environment effects revealed significant differences for yield. Genotype by environment interactions was significant, indicating that there is genetic variability among genotypes for yield in the changing environments. The relationships observed among test locations using GGE biplot revealed three mega-environments. This indicated that classifying genotypes into mega-environments implied higher heritability and faster progress for plant breeders and higher yields for growers. AMMI analysis revealed six stable genotypes G11(BPA2002), G15 [BHG(13)MO.2], G7 [BTAM(13)MO.3], G14 [EZAMMAR(13)MO.1], G9 [BPAN(13)MO.2] and G16 [BPAN(02)14] which contributed to relatively lowest interaction. Generally, these results showed that genotypes with above average means of seed cotton yield, good fibre traits and stability were considered for further evaluation in national performance trials prior to release.
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 3 (2017)
       
  • GENES ACTION IN SALINITY TOLERANCE AND THE IMPLICATION IN RICE BREEDING

    • Authors: Oumarou Souleymane, Mahamadou Salifou, Massaoudou Hamidou, Baboucarr Manneh, Eric Danquah, Kwadwo Ofori
      Pages: 115 - 120
      Abstract: The current study was to understand the genes action in salt tolerance of rice and its use in the future breeding program. The research was carried out in Niger Republic. 120 F3 lines derived from F2 individual plants were evaluated along with their parents in farmer’s field affected by the salt problem. The experimental design was 25*5 Alpha lattice with three replications. Data were analyzed using SAS software version 9.2. Hayman method was used to estimate gene effect.  A significant additive gene action was notified in terms of tiller number (at P= 0.01), panicle number (P=0.05) and panicle weight (P=0.05). Suggesting that selection for high tillering ability, tillers fertility and panicle fertility in salt stress conditions at early generation would be fruitful. Partial dominance effect was detected in traits including the height and duration. This implied that breeding for early maturing height can be influenced by segregation. The additive maternal effect was found for duration and height. Thus, to improve the duration and height under salt stress the progeny should have a salt tolerant female parent.
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 3 (2017)
       
  • COMPLETE CHLOROPLAST GENOME SEQUENCE OF ASPARAGUS (ASPARAGUS OFFICINALIS
           L.) AND ITS PHYLOGENETIC POSITION WITHIN ASPARAGALES

    • Authors: Wentao Sheng, Xuewen Chai, Yousheng Rao, Xutang Tu, Shangguang Du
      Pages: 121 - 128
      Abstract: Asparagus (Asparagus officinalis L.) is a horticultural plant with health care, which is meaningful to sequence the entire chloroplast (cp) genome of asparagus with Hiseq4000 platform. The complete cp genome maps a circular molecule of 156,699bp built with a quadripartite organization: two inverted repeats (IRs) of 26,531bp, separated by a large single copy (LSC) sequence of 84,999bp and a small single copy (SSC) sequence of 18,638bp. A total of 112 genes comprising of 78 protein-coding genes, 30 tRNAs and 4 rRNAs were successfully annotated, 17 of which included introns. The identity, number and GC content of asparagus cp genes were similar to those of other asparagus species genome. Analysis revealed 81 simple sequence repeat (SSR) loci, most composed of A or T, contributing to a bias in base composition. A maximum likelihood of phylogenomic evolution analysis showed that asparagus was closely related to Polygonatum cyrtonema that belonged to the genus Asparagales.The availability of the complete cp genome sequence of asparagus provides valuable information for chloroplast genetic engineering and phylogenetic analyses in Asparagales.
      PubDate: 2017-12-22
      Issue No: Vol. 5, No. 3 (2017)
       
 
 
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