Identifying Inbred Lines Capable of Improving Ear and Stover Yield and Quality of Superior Silage Maize Hybrids

Abstract

should also be practiced on whole-plant digestibility (Barriè re et al., 1997). Stover is as important as the ear Maize (Zea mays L.) is an excellent feed, whether fresh, chopped, because it contributes half of dry matter yield. Roth et or ensiled. Silage maize hybrids have been developed for temperatecold regions of Europe and North America, but limited research al. (1970) suggested that silage maize is primarily a high has been done to develop silage hybrids for temperate and warm-energy feed, and that its nutritive value can be enhanced temperate regions. This study was conducted to identify inbred lines by increasing its digestibility. They also proposed that that could be used to enhance the stover and ear fractions of existing selection for improvement of silage maize should be hybrids for warm-temperate areas. Forty-five single-cross hybrids based on whole-plant digestible dry matter yield. Gewere developed from 10 inbred lines and evaluated in six environnetic variation in digestibility and energy value was demments. Ten inbred lines were evaluated for potential to improve the onstrated in experimental and commercial hybrids (Vatbest hybrids by Dudley's and Metz's methodologies. Hybrids differed tikonda and Hunter, 1983), suggesting that maize forage significantly (P Ͻ 0.01) for ear (EY), stover (SY), and whole-plant quality could be improved via selection. Deinum and dry matter yield (WY), in vitro digestibility of whole-plant dry matter Bakker (1981), Vattikonda and Hunter (1983), and Ar-(iDW), and whole-plant digestible dry matter yield (WDY), differences among hybrids were not significant for in vitro digestibility of gillier et al. (1997) reported that characteristics related ear (iDE) and stover (iDS). Four outstanding hybrids were selected to forage digestibility were consistent over a wide range as target hybrids for improvement on the basis of YS i (Kang's Yieldof environments. Stability Statistic) of mean WDY and their stability across environ-Methods have been developed to select for grain yield ments. Inbred lines that were able to increase SY were not the same and stability of grain yield across environments (Kang ones that would increase EY. Inbred PR4 had outstanding potential Bachireddy et al., to improve the SY of any hybrid. Inbred B84 had greatest potential 1992). These methods have not been applied previously to enhance EY. Inbred lines showed differential capacity to generate to maize forage yield, although both high and stable improvement according to the fractions that were evaluated. Finally, levels of forage production are desired by growers. In inbred lines from the North American Corn Belt did not demonstrate addition to the difficulty in selecting stable, high-yieldpotential for enhancing SY when they were compared with local flint inbred lines.

Genotype × environment interactions and simultaneous selection for high oil yield and stability in rainfed warm areas rapeseed (Brassica napus L.) from Iran

“…For example, Waldron et al (2002) used it to study stability of yield of cool-season pasture grasses; Gravois and Helms (1998) and Gravois and Bernhardt (2000) used yield stability statistic to select rice cultivars for seed yield and seed quality, respectively; Fan et al (2007) evaluated grain yield stability of maize hybrids; Upadhya and Cabello (2000) evaluated the stability of potato seed families; Baxevanos et al (2008) reported very high repeatability of yieldstability statistic in multi-environment trial of cotton cultivars; Rao et al (2002) used of YS i to select foodgrade soybean genotypes for some agronomic traits, e.g., plant height, seed weight, biomass, seed yield, and harvest index. In addition, Bertoia et al (2002) used of YS i to identify superior maize hybrids on the basis of forage yield and stability.…”

Nutritive value of dehydrated whole maize plant and its effect on performance and carcass characteristics of rabbits.

“…Maize grain has a digestible energy (DE) content much higher than maize stover and it is assumed that the quality of forage maize is determined only by the ear to stover ratio, but this trait does not adequately predict the nutritional value of maize (Bertoia et al, 2002). Due to its high humidity, whole maize plant requires to be dehydrated before inclusion in pelleted diets for rabbits and the maturity stage is important, since the dry matter (DM) content of maize plant increases from 23 to 37% during the maturing process of the grain (Abreu et al, 2000).…”

Biplot Analysis of Forage Combining Ability in Maize Landraces

“…Thompson (1968) found that a group of exotic and semi-exotic populations yielded on average 28% more digestible dry matter than adapted hybrids, and Stuber (1986) suggested that some semi-exotic materials might be suitable for silage, given their good grain production and great vegetative development. More recently, Bertoia (2001) noted that landraces with no history of breeding for grain production generated crosses with good forage potential, whereas inbred lines from the North American Corn Belt did not demonstrate potential for enhanced stover yield and quality when compared with inbred lines from Argentine germplasm (Bertoia et al, 2002).…”