一年生野生大豆耐濕性機(jī)理的研究.pdf

1、一年生野生大豆耐濕性機(jī)理初步研究摘要我國南方年降水量多，土壤質(zhì)地粘重，地下水位高，種植常用的優(yōu)質(zhì)高產(chǎn)豆科牧草常因不耐濕而難以發(fā)揮生產(chǎn)優(yōu)勢篩選和應(yīng)用耐濕豆科牧草對保障南方農(nóng)區(qū)畜牧業(yè)的迅速發(fā)展具有重要意義一年生野生大盂(GlycinesojaSiebetZuee)是廣泛分布于我國南北各地和東亞東部的草本植物，莖葉繁茂，適應(yīng)性廣。具有作南方農(nóng)區(qū)飼草栽培利用的潛力為闡明一年生野生大豆的耐濕機(jī)制，本研究以江蘇省啟東市寅陽鎮(zhèn)圓陀角海灘，句容市寶華山

2、山坡地和山東省東營市黃河三角洲等地采集的一年生野生大豆為材料，對苗期生長進(jìn)程中根、莖通氣組織的發(fā)育進(jìn)行了跟蹤觀測和淹水處理對其影響研究探討了一年生野生大豆皮層通氣組織開始形成的時問和部位以及淹水誘導(dǎo)皮層通氣組織形成最適宜的時間長度和最適宜生長期結(jié)果表明，在正常生長條件下，一年生野生大豆播種后35周根系開始形成皮層通氣組織，經(jīng)過2周左右基本形成根系與莖貫通的通氣道。皮層通氣組織首先在根莖連接點上下開始形成，此后，向根尖方向和莖部擴(kuò)展采自不

3、同生態(tài)環(huán)境的一年生野生大豆根莖皮層通氣組織開始形成的時間上存在差異句容野生大豆早于啟東野生大豆，啟東野生大豆又早于黃河三角洲野生大豆淹水處理試驗結(jié)果顯示，淹水處理促進(jìn)一年生野生大豆皮層通氣組織的發(fā)育淹水持續(xù)12，3周，啟東野生大豆和黃河三角洲野生大豆皮層通氣組織占橫切面的比例和孔隙度均顯著高于對照(Po05)不同生長期淹水處理試驗結(jié)果表明，淹水誘導(dǎo)皮層通氣組織形成最適宜的生長期為播種后34周。播種后3，4周淹水，根系空隙度顯著高于其它生

4、長期淹水(Po05)，ASTUDYONTHEMECHANISMOFⅥATERLOGGINGToLERANCEINANNUAL吼DSOYBEAN(GLYCINEsoJa)ABSTRACTComparedtotheenvironmentofanyotheraYea$ofchina’theoneofsouthchinaisknewnforitsgreatpreeipitation，claysoilandhightgroundwaterleve

5、lwhichpreventmanylegumeforagesspeciesfromsatisfactorygrowthandyieldsSo，inordertopromotesustainableandproductivestockbreedingItisurgenttoin廿oducesomeforagesspeciesadaptabletotheenvironmentofsouthchinaOneofmanypromisingleg

6、umeforagespeciesisannualwildsoybeanaproductivegrasswhoseecotypesCanbefoundalloverthechinaandeasternpartofEastAsiatheseecotypesrespondphysiologicallyandmorpholo百callytofloodingconditioninregardtotheirwaterloggingtolerance

7、InordertoinvestigatethemechanismofwaterloggingtoleranceofannualwildsoybeanananatomicalobservationOildevelopmentofrootandstemandfloodingeffect011itwerecarriedoutwiththematerialscollectedfromtheYuanmojiaobeachinYmyangtownQ

8、idongcityJiangsuprovinceandhillsideofBaohuaMountaininJurongcountyofJiangsuprovince，anddeltaofYellowRiverinDongyincityShandongprovinceTheresultsindicatedthatannualwildsoybcanbeganformingthecortexaerenchymaat35weeksaRersow

9、ingandthentheaerenchymadevelopedcompletelyfromroottostemafter2weeksTheaerenchymaofannualwildsoybeanfirstlyformedatthepositionnearrootcollarandthenitextendedtootdpandstemThetimeofaerenchymaformationdifferedwithinthemateri

10、alsTheresultsoffloodingexperimentshowedthatfloodingpromotedtheformationofcortexaerenchymainannualwildsoybcallTheproportionsofcortexaerenchymaaccountingfortransversesectionandsporositywerenoticeablyhigherthanthoseofthecon