本文選題：溫度　切入點：鹽脅迫　出處：《內(nèi)蒙古農(nóng)業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：為了促進(jìn)檉柳屬植物資源的合理開發(fā)與利用,以多枝檉柳(Tamarix ramosissima Ledeb.)、檉柳(Tamrix chinensis Lour.)、細(xì)穗檉柳(Tamarix leptostachys Bunge)為試驗材料,研究在不同溫度、不同氯化鈉(NaCl)濃度、不同聚乙二醇(PEG)濃度、砂床環(huán)境下種子萌發(fā)特性;試驗分析了不同樹齡多枝檉柳種子的種子萌發(fā)特性及其與抗逆性的關(guān)系;以多枝檉柳、檉柳、細(xì)穗檉柳和鹽地檉柳(Tamarix karelinii Bunge)為嫩枝扦插材料,試驗研究了插穗在不同激素(萘乙酸NAA、吲哚丁酸IBA和混合溶液NAA+IBA比例1:1)、不同激素濃度梯度(200ppm、300ppm、400ppm、500ppm)和不同處理時間(浸泡30min和速蘸2～3S)對嫩枝插穗生根情況的影響,篩選出最佳處理方法。試驗結(jié)果表明:1.多枝檉柳在25℃時發(fā)芽率最高,發(fā)芽率為84.00%,NaCl溶液對該種種子萌發(fā)有抑制作用,當(dāng)PEG45%時,對該種種子發(fā)芽有明顯促進(jìn)作用。2.檉柳在25℃時發(fā)芽率最高,發(fā)芽率為97.33%,NaCl溶液對該種種子萌發(fā)有抑制作用,PEG對該種種子發(fā)芽促進(jìn)作用不明顯。3.細(xì)穗檉柳在20℃發(fā)芽率最高,為77.33%;NaCl溶液對該種種子萌發(fā)有抑制作用。PEG25%對該種種子發(fā)芽有明顯促進(jìn)作用。4.通過多枝檉柳種子萌發(fā)試驗中看出古樹種子的耐鹽和耐干旱性顯著高于10～12年齡級種子。嫩枝扦插中四種檉柳屬樹種枝條基部插穗和上部插穗生根率無顯著性差異,但綜合生根情況基部插穗好于上部插穗。激素對四種檉柳嫩枝扦插有促進(jìn)作用:(1)用濃度500ppm NAA+IBA混合溶液浸泡多枝檉柳生根率達(dá)到94%。(2)用濃度500ppm NAA+IBA混合溶液速蘸處理檉柳生根率達(dá)到80%。(3)用濃度500ppm IBA溶液速蘸處理細(xì)穗檉柳后生根率達(dá)到76%。(4)用濃度400ppm IBA溶液浸泡鹽地檉柳生根率達(dá)98%。
[Abstract]:In order to promote the rational exploitation and utilization of Tamarix ramosissima Ledeb. Tamarix ramosissima Lour., Tamarix chinensis Lour. and Tamarix leptostachys Bungeg of Tamarix chinensis, Tamarix leptostachys Bunge. were used as experimental materials to study the different concentrations of sodium chloride and polyethylene glycol (PEG) at different temperatures, different concentrations of sodium chloride, and different concentrations of polyethylene glycol (PEG) in Tamarix ramosissima, Tamarix chinensis Lour.and Tamarix leptostachys Bunge. of Tamarix chinensis. The characteristics of seed germination in sand bed, the relationship between seed germination characteristics and stress resistance of Tamarix chinensis seeds of different tree ages were analyzed, and Tamarix karelinii Bungees of Tamarix karelinii and Tamarix karelinii Bungees were used as cutting materials. The effects of different hormones (NAA of naphthyl acetate, IBA of indole butyrate and NAA IBA of mixed solution) on rooting of shoot cuttings were studied. The results showed that the germination rate of Tamarix chinensis was the highest at 25 鈩，

本文編號：1599079