Diallel analysis of varying late season night temperatures on the development of a range of fluecured tobacco (Nicotiana tabacum l.) genotypes : a thesis presented in partial fulfillment of the requirements for the degree of Masterate of Agricultural Science in Plant Science at Massey University

Pg 62 not in original - misnumberedA study was conducted in the climate room facilities, at D.S.I.R. Plant Physiology Division, Palmerston North, on the effect of varying late season night temperatures on the development of a range of flue-cured tobacco genotypes. The study involved imposing three night temperatures, 10°C, 15°C and 20°C, when the plants came into flower. Ten F1 genotypes of a five parent diallel cross (no parents, no reciprocals) were grown at each night temperature with three replications per temperature. Fourteen morphological, physical and chemical characters were measured. The effect of late season night temperature was negligible but there was some evidence of genotype environment interaction for some of the characters. The experiment was conducted using single plants as plots and the statistical analysis showed acceptable coefficients of variation for biological studies. The genetic analysis of the diallel showed that general combining ability variance is the most important type of genetic variance in the characters examined. This agrees with the majority of other tobacco diallel studies. As general combining ability variance is largely a measure of additive genetic variance, breeding homozygous lines from a heterozygous base population should be the best approach to follow. Heritability values were of sufficient size for several of the commercially important characters to indicate that improvement through selection was possible. General combining ability and phenotypic simple correlations between pairs of characters were generally in good agreement, demonstrating that phenotypic selection will result in altering the genotypes in the desired direction for the characters in question. The experiment showed a large negative correlation between the two economically important characters, yield and total nicotine alkaloids. This result is in agreement with similar studies carried out by other workers in this field. The experiment revealed a number of improvements which could be useful in the conduct of future tobacco climate room studies

Combining ability of doubled haploids in Coffea canephora P.

Afin d'étudier leur aptitude à la combinaison, cinquante-cinq haploïde-doublées (HD) de #Coffea canephora ont été croisés avec soit des génotypes hétérozygotes soit des génotypes HD. Trois essais agronomiques ont été établis. Une vigueur hybride marquée est observée pour tous les caractères analysés dont la production. Des différences importantes sont mises en évidence entre HD produits à partir d'un même clone reflétant le haut niveau d'hétérozygotie des clones. L'analyse d'un plan factoriel de croisement indique que la variance génétique est essentiellement due aux effets additifs pour la production ainsi que pour la hauteur des arbres et la forme des feuilles. L'aptitude générale à la combinaison apparaît aussi prédominante pour le diamètre au collet et la résistance à la rouille bien que des effets d'interaction soient détectés. Des combinaisons hybrides ont une productivité semblable à celle de variétés clones témoins. Les implications de ces résultats pour l'amélioration génétique de #Coffea canephora sont discutées. Particulièrement, le développement de variété hybride F1 est envisagé. (Résumé d'auteur

A Hybrid Sequencing Approach Completes the Genome Sequence of Thermoanaerobacter ethanolicus JW 200

Thermoanaerobacter ethanolicus JW 200 has been identified as a potential sustainable biofuel producer due to its ability to readily ferment carbohydrates to ethanol. A hybrid sequencing approach, combining Oxford Nanopore and Illumina DNA sequence reads, was applied to produce a single contiguous genome sequence of 2,911,280 bp

Combining ability of tomato lines for fruit quality traits

Digitized 2007 AES MoU.Includes bibliographical references (page [31])

Biomimetic microelectronics for regenerative neuronal cuff implants

Smart biomimetics, a unique class of devices combining the mechanical adaptivity of soft actuators with the imperceptibility of microelectronics, is introduced. Due to their inherent ability to self‐assemble, biomimetic microelectronics can firmly yet gently attach to an inorganic or biological tissue enabling enclosure of, for example, nervous fibers, or guide the growth of neuronal cells during regeneration