. Traversée du maïs sucré. Le maïs sucré, le maïs hybride. La production de lignées 511 manière, il est possible de produire un grand nombre de lignées fixées sur un petit salon avec un minimum de travail de pollinisation manuelle. Certaines de ces lignes quand le test devrait être trouvé pour donner les résultats désirables lorsque croisées. Une méthode que nous avons utilisée est de planter une oreille d'une colline. Six graines sont prises de chaque oreille, enveloppé dans du papier de soie et un paquet abandonné à la main dans chaque colline. Les collines sont éclaircis à trois branches, et deux oreilles de chaque colline, sont pollinisées à la main. À la récolte, les deux oreilles sont examinées, mais un seul est sauvé

• Contributeur: The Book Worm / Alamy Banque D'Images
• ID de l’image: RE5H7B
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. Crossed sweet corn. Sweet corn; Hybrid corn. The Production of Inbred Strains 511 way it is possible to produce a large number of inbred lines on a small area with a minimum of labor of hand-pollination. Some of these lines when tested should be found to give desirable results when crossed. One method that we have used is to plant one ear to a hill. Six seeds are taken from each ear, wrapped in tissue paper and one packet dropped by hand in each hill. The hills are thinned to three stalks, and two ears in each hill are hand-pollinated. At harvest both ears are examined, but only one is saved. This is continued for three generations. Each ear represents one line. No individual labelling of the lines is necessary at any time. In this way a large number of inbred lines are available for selection after homozygosity is, reached. In the fourth or later generations enough plants can be grown to have an estimation of the line's worth al- though it is possible to obtain some idea from a single hill.. Figure 103. Ear shoot ready to bag, bag in place, and ear shoot showing silks ready to pollinate. Theoretically there is a possibility of better recombination of characters when the inbreeding is done by sib mating (one plant pollinated by another in the same progeny) than by self-fertilization. Off-pollination is more easily performed than self-pollination. The plants are less injured by the manipulation of bagging when only one bag is used and the silks and tassels can be selected to come more nearly at the same time. This is especially worthwhile with very early corn that makes small plants after they are inbred for a few generations. A report on the results obtained from sib- pollinated lines will be given later. It is sufficient to say here that it is a promising method of procedure, one that gives inbred strains that are not too much reduced in vigor.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabil

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