Evaluation Of Main Germplasm Resources About Different Degree Of Bending In Cucumber

Cucumber's value is mainly determined by external morphology.Cucumber-shaped fruit is one of very important quality of the appearance.The Curving cucumber fruit had poor marketability would created the very great economic loss in the production.This experiment used 48 varieties resources research,has been defined standard about different degree of bending in cucumber.It has provided the basis for the cucumber different degree of bending in heredity rule research and the high commodity rate selective breeding.At the same time,from the endogenous hormones and the organization anatomy aspect studies different degree of bending in cucumber about physiological development difference.The main results are shown as follows:1.Through cutting method of bending angle to measurement to cucumber.Rests on the fruits L/D index the classification,divides into 3 kinds of the different index,the short fruit(L/D is smaller than 5),the fruit(L/D in 5-8),the long fruit(L/D is bigger than 8).The cucumber fruit has differed from based on the fruit index type's different definition's bending.The short fruit bending 0°to be suitable the straight fruit,what melon body camber in 0-10°is the time is curving and 10°above is abnormal.The fruit melon body camber 0-5°to be suitable the straight fruit,the melon body camber in 5-15°is a curve,the melon body crooked 15°-90°is the curving melon,90°above is the abnormal melon;What long fruit melon body camber 0-10°is suitable the straight melon, what melon body camber in 10-30°is a curve,the melon body camber 30°-120°is the curving fruit, 120°above is the abnormal melon.The bending and fruit character have some certain relevance,fruit length,fruit stalk length, cavity size/fruit diameter to be take the fruit different degree of bending of the appraisal target. Length/diameter,cavity size may take the auxiliary target.Carries on the regression analysis to it, has established multiple regression analysis equation Y=11.205+0.44 X₁+3.992 X₃-15.353 X₉.And Y is cucumber curving value,fruit stalk length is X₁,X₃ is fruit length,X₉ is fruit cavity/fruit diameter.2.Screening 8 straight species is D0405,D0118,F02-07-04,D0115,D0410,D0455,D9419, D0422,D0401,D0115 and D0118 is the L/D small than 5.thay are a circular.Have 9 species are little bending,bending varieties 31 species.And,D2002 is that the fruit handle is short,and only has the mild curving variety in the fruit handle place.It's bending the uniformity and better regularity.3.What explanation to leading cucumber fruits about different degree of bending is ZR and ABA.The different curving way's variety have the same rule.spinal cell ZR content is higher than the abdomen;the ABA content is lower than the abdomen.Other two kinds of hormone content changes do not have the regularity.In the different times,in the same varieties,the GA content level has the similar change tendency,exocarp＞core＞mesocarp and endocarp.The ZR content change tendency is mesocarp and endocarp＞exocarp＞core,IAA rule is exocarp＞mesocarp and endocarp＞core,ABA content size is core＞exocarp＞mesocarp and endocarp.The GA content rises gradually in the longitudinal distribution from the crown to the base,the ABA content drops gradually from the crown to the base.Regardless in the cucumber immature and in the mature period,endocarp hormone content is GA＞IAA＞ZR＞ABA,the mesocarp and endocarp in the different time hormone content is GA＞ZR＞IAA＞ABA,the biggest hormone content in core at immature season is GA,IAA and the ABA content is simple,the ZR content is quite least.The mature period core hormone change is: GA＞IAA＞ABA＞ZR,namely along with the fruit growth,the core place IAA content increases quickly.At 5^th day and 11^th day,D2009 normal pollination of the IAA,ABA and ZR three kind of hormone content to be higher than the lateral pollination,the GA content is lower than the lateral pollination content.4.After study on the cucumber fruit base curving,middle curving and the top of curving organization anatomy research and found,in the identical variety,the cucumber various spots endocarp cell is the rectangle,the abdomen peel cell area is smaller than a spinal department,is obvious difference with other spots epidermal cell size.The abdomen near cortex parenchyma cell area is also smaller than spinal department,arranges is closer than the spinal department.The abdomen near cortical cells transit from small to big slowly,the spinal department is quick with other spots change.D0422 epidermal basal cell area is larger than the top.The mesocarp cell characteristic for the fruit various spots is arrangement rule as the circular, the oval.The abdomen mesocarp parenchyma cell area is smaller than spinal department,has the obvious difference with other spots parenchyma cell size.The arrangement compares the spinal department is closer.