Development of the flower and macrogametophyte of Allium cepa
AuthorsH. A. Jones
S. L. Emsweller
Authors AffiliationsH. A. Jones was Professor of Truck Crops and Olericulturist in the Experiment Station; S. L. Emsweller was Assistant Professor of Truck Crops and Assistant Olericulturist in the Experiment Station; resigned September 1, 1935.
Hilgardia 10(11):415-428. DOI:10.3733/hilg.v10n11p415. December 1936.
Abstract does not appear. First page follows.
In central California mother bulbs of the onion (Allium cepa L.) used for seed production are usually set in the field during late November and December. Subsequently, a number of leaves are formed at each of the several growing points before the inflorescence axis is differentiated fig. 1, A). The method of leaf development has been adequately described by Hoffman.(2)4 Briefly, the leaves are two-ranked, the blade of each new leaf arising at an angle of 180° from that of the next older. That side of the apical meristem opposite the preceding blade is the first to differentiate; and as this region develops an upward growth of tissue soon completely encircles the growing point of the stem, differentiating the new leaf.
In Maryland, Jones and Boswell(4) found that the primordium of the inflorescence axis differentiated in March when mature bulbs were planted in the field in October. In California, bulbs planted in December had floral axes differentiated in February.(3) The first stages in the development of the primordium of the leaf and that of the inflorescence axis appear to be very similar. In the latter the single involucral bract is first evident at a point opposite the youngest leaf blade. At the first appearance of the bract, one cannot tell whether the new primordium is that of a leaf or of a bract.
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Also in this issue:Lemon industry in California: Economic objectives and operation of state marketing order for lemon products analyzed in terms of its effectiveness
House packing western lettuce: Changing methods of harvesting head lettuce in the Salinas district create problems for operators of packing houses
Reduction of wildfire hazard: Correct timing of prescribed burning of dead vegetation in timber reduces danger of uncontrolled fires in those areas
Gains of two types of lambs: Suffolk cross lambs from whiteface ewes showed slightly faster gains than Corriedale crosses in comparative study
Aqua and anhydrous ammonia: Good sources of nitrogen fertilizers but materials should be placed well away from plants to lessen chance of injury
Nitrate levels for vaiencias: Tree growth improved in soil and solution cultures when nitrogen was maintained at relatively high concentrations
Phosphorus in citrus soils: Removal and redistribution of phosphorus from the soil during twenty-eight years of cropping with citrus studied
Pest control sprays on oranges: Effects of oil and parathion sprays on orange fruit size and quality. subject of three-year study in southern California
B Vitamin content of avocados: Studies reveal California-grown avocados are in superior group of foods as source of pantothenic acid and vitamin B
Ontogeny and structure of collenchyma and of vascular tissues in celery petioles
Vessel development in celery