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Saline Stress Alters the Temporal Patterns of Xylem
Differentiation and Alternative Oxidase Expression in Developing
Soybean Roots 总被引:2,自引:0,他引:2 下载免费PDF全文
Mirna Hilal Ana M. Zenoff Graciela Ponessa Hortensia Moreno Eddy M. Massa 《Plant physiology》1998,117(2):695-701
We conducted a coordinated biochemical and morphometric analysis of the effect of saline conditions on the differentiation zone of developing soybean (Glycine max L.) roots. Between d 3 and d 14 for seedlings grown in control or NaCl-supplemented medium, we studied (a) the temporal evolution of the respiratory alternative oxidase (AOX) capacity in correlation with the expression and localization of AOX protein analyzed by tissue-print immunoblotting; (b) the temporal evolution and tissue localization of a peroxidase activity involved in lignification; and (c) the structural changes, visualized by light microscopy and quantified by image digitization. The results revealed that saline stress retards primary xylem differentiation. There is a corresponding delay in the temporal pattern of AOX expression, which is consistent with the xylem-specific localization of AOX protein and the idea that this enzyme is linked to xylem development. An NaCl-induced acceleration of the development of secondary xylem was also observed. However, the temporal pattern of a peroxidase activity localized in the primary and secondary xylem was unaltered by NaCl treatment. Thus, the NaCl-stressed root was specifically affected in the temporal patterns of AOX expression and xylem development. 相似文献
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Various aspects of the reproductive biology of Atamisquea emarginata Miers ex Hook. et Arn. were studied in a population from Tucumán, northern Argentina. Flowering took place in late (austral)
spring to early summer. The creamy white, entomophilous flowers were protandrous and lasted 3.5–4.5 days. A pleasant odor
along with nectar and pollen attracted 36 mostly diurnal insect species of which 41.7% were Hymenoptera, 38.9% Lepidoptera
and 19.4% Diptera. However, 75% from all recorded species were infrequent, and domestic bees made ca. 94% of all visits. One
halictid bee, one sphecid wasp, one myzinid wasp, four small- to medium-sized butterflies and a hawkmoth completed the set
of relatively frequent insect visitors. Pollen and stigma were presented in the same place within the flower, but interference
was prevented by a movement-assisted, complete dichogamy mechanism in which the bending ability of the gynophore played a
fundamental role. This form of dichogamy was previously unknown in the Capparaceae. In comparison with the known species of
the closely allied genus Capparis L., A. emarginata has diurnal, smaller, longer-lasting flowers, that offer much smaller nectar amounts, and that attract a rather generalized
array of non-hovering visitors, while Capparis behaves as a more crepuscular-biased sphingophile or ornithophile or chiropterophile. Low levels of seed set under bagging
indicates dependence on insect visits and are partly congruent with an earlier report of self-incompatibility in A. emarginata. Pollen tubes arrived to ovules in 90.6% of the inspected flowers. Fruit set of open-pollinated flowers was 43.6%–53.7%.
Ninety-five percent of all ovules were regularly aborted in each fruiting ovary; thus, each fruit contained 1.2 developed
seeds. Full-sized individuals were expected to produce ca. 10,700 potential offspring per year.
Received August 19, 2002; accepted October 8, 2002 Published online: February 7, 2003 相似文献
3.
Ibañez M. S. Mercado M. I. Coll Aráoz M. V. Zannier M. L. Grau A. Ponessa G. I. 《Journal of plant research》2017,130(2):327-337
Journal of Plant Research - Yacon (Smallanthus sonchifolius, Asteraceae) is an ancient andean crop that has numerous dietary and medicinal properties. Morphological and anatomical features and... 相似文献
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