Study Of Robinia Pseudoacaia Fruit, Seed And Seedling Characters Of Different Provenances From The United States

Abstract: Robinia pserdoacacia L.is a legume (Leguminosae) locust (Robinia L.), adeciduous tree, naturally distributed in the United States, the natural distribution isdivided into two parts, the eastern region extending from central Pennsylvania toAlabama and Georgia in the northern part of the Appalachian. Mt, the western areaincludes Missouri Southern of the Ozark plateau, Al Kansas and winter of thenorthern and Eastern oklahoma. Introduced in China in1898, after the introduction ofplanting expand rapidly, according to the survey, China’s mainland exceptHeilongjiang and Hainan Province, other provinces and autonomous regions arecultivated, of which15will be listed as the main afforestation tree species of blacklocust, locust area in China in about10,000,000hm2above. Locust is a multipurposetree species important, has many excellent characteristics in the aspects of material,stress resistance, biomass, is China’s arid, semi-arid area pioneer tree. At present, athome and abroad on Robinia pseudoacacia provenances have research on, but theresearch object is mostly secondary provenances of black locust, some even nativeprovenance, but also not system. Therefore, this test from the United States introducedblack locust origin of32provenances of Acacia seeds, makes a comparative study ofdifferences on Seedling Characters of fruits and seeds, the main research results show:(1) There was significant difference of fruit and seed traits of different provenances.Fruit and seed number per fruit good ovule number28seed sources are more, thesource is to provide a large number of seeds are good sources.28,31kinds of sourcefruit area of relatively large, is the source of a large number of ovules with.19,31kinds of source is the source for the1000-grain weight is relatively large,29,6kindsof source is the source of seed a relatively large area.16,24kinds of source energyand germination rate is higher,31provenances of higher germination rate,germination potential higher No.7seed sources, and1kinds of source energy andgermination rate is low.(2) After a preliminary comparison, difference of annual seedling height anddiameter growth among provenances were significant,6, No.7provenances of annual seedling height growth and diameter growth was maximum, that the two kinds ofsource is suitable for Mengjin local growth of Robinia pseudoacacia provenances.(3) The fruit and seed characters by the kinds of source location, geographicalvariability, but different trait variation law of different. The number of seeds per fruitgood fruit increased with latitude increasing, single ovule number decreases withlatitude increasing, fruit length increases with latitude increasing, fruit width and fruitarea decreases with the increase of altitude. The seed germination rate andgermination increased with latitude increased, seed area affected by a factor of twolatitude and altitude, and increases with latitude increasing, and decreases with theincrease of altitude. Effects of various characters on the longitude of fruits and seedsare not obvious. The amount of annual seedling growth by a source location was notaffected. The fruit and seed and seedling traits of different provenances hadcorrelation between. The germination rate and germination potential and fruit length,fruit size, fruit width and fruit, seedling height and ground diameter were highlysignificant positive correlation. Thousand grain size and grain weight, germinationrate, germination potential was positively correlated, suggesting that seed area isgreater, the greater the weight of seed, seed germination rate and germinationpotential and higher. In addition, fruit, seed and seedling traits were not significantbetween.(4) In the fruit and seed characters and seedling plant growth index were the result ofcluster analysis,32kinds of sources can be divided into four categories, the firstcategory:1,16,21,25,2,30,13; second:6,7,17,22,28,29; class third:19; theremaining fourth class. For the same source with some regularity in latitude andaltitude factor, but the difference was not significant between classes.(5) The principal component analysis of all indexes of different kinds of seeds andseedlings of each sample is calculated, the score,6,7,31, a source of higher scores,for high quality source, No.21seed sources the lowest score.(6) The research is only on geographic variation characteristics of Robiniapseudoacacia origin source fruit, seeds. Other such as material, resistance and othercharacteristics of the geographical variation of, to be discussed in the future work.