| 单词 | self-pollination |
| 例句 | The semi-acrobatic duet that illustrates rice’s self-pollination stylizes the sex out of sex. Review: ‘Rice,’ by Cloud Gate Dance Theater of Taiwan, Honors a Crop and a People 2015-09-18T04:00:00Z Biochemical and anatomical barriers to self-pollination promote cross-pollination. Concepts of Biology 2013-04-25T00:00:00Z Making the inbred lines requires repeated self-pollination over many generations. This spud’s for you: A breeding revolution could unleash the potential of potato 2019-02-07T05:00:00Z Each vine produces one of two types of flowers, which is thought to prevent self-pollination. Spring Awakens! And Partridgeberry Has the Proof 2018-03-07T05:00:00Z In England, self-pollination is the flower's main mode of reproduction; in Mediterranean populations, bees occasionally facilitate crosses between different plants. Evolution: Darwin's domestic discoveries : Nature : Nature Research 2017-08-22T04:00:00Z Tomatoes are able to fertilise themselves, without need of a pollinator, yet even this self-pollination can be assisted by a bee visiting a flower. Bee kind to viruses 2016-08-10T04:00:00Z By this arrangement self-pollination is prevented and cross-pollination ensured by the visits of bees which come for the honey secreted by the glands at the base of the inner stamens. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 7 "Geoponici" to "Germany" 2011-09-26T02:00:25.313Z Darwin and other scientists concluded that this was a mechanism to minimize self-pollination and promote cross-fertilization, with the aid of pollinating insects. Primroses can get you primed for spring 2011-03-16T20:23:21Z Only around 1 in 10,000 pollen grains have the small genetic mutation which will allow self-pollination to take place. 2010-01-19T19:43:00Z The opposite of allogamy is autogamy, or self-pollination. The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide The floral mechanism is both simple and effective, favouring cross-pollination, but ensuring self-pollination should that fail. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Like the Mayette, its pistillate blossoms appear ten days or more after the staminate blossoms and self-pollination is not effected. Northern Nut Growers Association Report of the Proceedings at the 43rd Annual Meeting Rockport, Indiana, August 25, 26 and 27, 1952 With cross-pollination a better set of nuts is to be expected than with self-pollination, as well as better filling of the kernels. Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948 Pollination in most grasses is brought about by wind, though in a few cases self-pollination occurs. A Handbook of Some South Indian Grasses This fact, and the fact that the crops are small, I have attributed to the partial inefficiency of self-pollination, there being no evident outside source of pollen. Northern Nut Growers Association Thirty-Fourth Annual Report 1943 Dr. von Faber of Java has recently shown that whilst self-pollination is the rule, cross fertilisation occurs between the flowers on adjacent or interlocking trees. Cocoa and Chocolate Their History from Plantation to Consumer In order to get the required amount of seed it is necessary in our climate to encroach as little as possible upon free pollination, aiding the self-pollination, but taking no precautions against intercrossing. Species and Varieties, Their Origin by Mutation Each minute floret has its five anthers so widely spread away from the stigmas that self-pollination is impossible; but with the help of small, winged pollen carriers plenty of cross-fertilized fruit forms. Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors All adaptations to cross-pollination might also be of use simply because they made pollination possible when for any reason self-pollination had become difficult or impossible. Darwin and Modern Science These alone become weaker by self-pollination; while pure species derive no advantage from crossing and no disadvantage from self-fertilisation. Darwin and Modern Science It is true that the phenomena observed in self-pollination, e.g. in Ipomoea, agree with those which are often noticed in hybrids; Darwin himself drew attention to this. Darwin and Modern Science Just as in some orchids and cleistogamic flowers self-pollination regularly occurs, so it may also occur in other cases. Darwin and Modern Science The stigmatic surface of the pistil is on the opposite side of the spoon, nearest the base of the flower, to guard against self-pollination. Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors The existence of plants for which self-pollination is of greater importance than it is for others is by no means contradictory to Darwin's view. Darwin and Modern Science An occasional crossing appears to be useful but not indispensable in all cases; its sporadic occurrence in plants in which self-pollination habitually occurs is not excluded. Darwin and Modern Science These cleistogamous flowers afford a striking example of habitual self-pollination, and H. von Mohl drew special attention to them as such shortly after the appearance of Darwin's Orchid book. Darwin and Modern Science |
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