本文選題：紅砂　切入點：家系選擇　出處：《甘肅農(nóng)業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：通過采集甘肅、內(nèi)蒙、寧夏三個紅砂天然分布區(qū)內(nèi)長勢良好的紅砂種子,并栽植于武威市羊下壩鎮(zhèn)(38°24′N,103°9′E)進行種源試驗。通過連續(xù)兩年對25個家系紅砂苗木的酶活性、滲透調(diào)節(jié)物質(zhì)含量、光合及熒光特性的測定,運用主成分分析法、隸屬函數(shù)法等方法分別選出3a生和4a生紅砂苗木抗旱性優(yōu)良家系,比較所選出3a生紅砂抗旱性優(yōu)良家系在到了第4年時,是否仍然為抗旱性優(yōu)良家系,及與抗旱性相關(guān)的不同指標間是否存在明顯的年際變化,并闡明產(chǎn)生變化的原因。篩選出能夠穩(wěn)定遺傳的抗旱性優(yōu)良家系,指導(dǎo)紅砂的種源選擇,為干旱荒漠化地區(qū)確定抗旱性強的紅砂品種提供理論依據(jù)及優(yōu)良的繁殖材料。試驗結(jié)果如下:1)表觀量子效率(AQY)、暗呼吸速率(Rd)、光補償點(LCP)、光飽和點(LSP)、最大凈光合速率(Pn_(max))、PSⅡ最大光化學(xué)效率(F_v/F_m)、PSⅡ潛在活性(F_v/F0)、光化學(xué)猝滅系數(shù)(qP)、非光化學(xué)猝滅系數(shù)(qN)、PSⅡ?qū)嶋H光化學(xué)量子效率Y(Ⅱ)、葉綠素(a+b)(Chl a+b)、葉綠素a/b(Chl a/b)、可溶性糖(SS)、可溶性蛋白(SP)、脯氨酸(Pro)15個指標在家系間差異極顯著(p0.01)。2)在3a生紅砂苗木抗旱性優(yōu)良家系的選擇中,通過計算3個主成分下不同家系的綜合得分進行抗旱性排序,按照30%的入選率,排名前8的家系分別為H SW-1ZZG2-1XKK-4LZ-1ZZG2-3XGG-3ZZG1-1HSZ-3號家系。通過隸屬函數(shù)值法,按照30%的入選率,篩選出8個抗旱性強的家系,抗旱性由強到弱依次為LZ-1HSW-1XKK-4ZZG2-1XGG-3ZZG2-3ZYGZ-1SD-3號家系。通過隸屬函數(shù)值法與主成分分析均入選的家系有HSW-1、XKK-4、ZZG2-1、LZ-1、XGG-3、ZZG2-3,重合率占75%,均入選的家系作為選擇出的抗旱性優(yōu)良家系。3)在4a生紅砂苗木抗旱性優(yōu)良家系的選擇中,通過計算3個主成分下不同家系的綜合得分進行抗旱性排序,按照30%的入選率,排名前8的家系分別為X KK-4HSW-1ZZG2-1XGG-3LZ-1ZZG1-1ZZG2-3HSZ-3號家系,通過隸屬函數(shù)值法,按照30%的入選率,對平均隸屬函數(shù)值進行排序,篩選出8個抗旱性強的家系,抗旱性由強到弱依次為XKK-4ZZG2-1HSW-1XGG-3LZ-1ZZ G1-1ZZG2-3SD-3號家系。通過隸屬函數(shù)值法與主成分分析均入選的家系有XKK-4、ZZG2-1、HSW-1、XGG-3、LZ-1、ZZG1-1、ZZG2-3,重合率占87.5%,用這兩種方法中的任何一種,都能評價紅砂的抗旱性,以均入選的家系作為選擇出的紅砂抗旱性優(yōu)良家系。4)主成分分析和隸屬函數(shù)值法都能將抗旱性強的家系篩選出來,且兩種方法評價得出抗旱性強的家系重合率為在75%以上,所選擇的3a生紅砂苗木抗旱性優(yōu)良家系XKK-4、ZZG2-1、HSW-1、XGG-3、LZ-1、ZZG2-3在4a生家系的選擇中同樣表現(xiàn)優(yōu)良,指標間年際變化差異性不大,這兩年任何一年的早期選擇都可作為預(yù)測紅砂今后抗旱性的依據(jù),篩選出的家系可作為抗旱的優(yōu)良品種。
[Abstract]:The provenance experiments were carried out by collecting red sand seeds from three natural distribution areas of Gansu, Inner Mongolia and Ningxia, and planting them in Yangxiaba Town, Wuwei City. The enzyme activities of 25 families of red sand seedlings were studied for two consecutive years. The content of osmotic regulating substances, photosynthetic and fluorescence characteristics were determined. Three and four year old red sand seedlings were selected to have good drought-resistance families by principal component analysis and membership function method, respectively. In the fourth year, the three year red sand families with good drought resistance were selected to compare whether they were still good families with drought resistance, and whether there were significant interannual changes among the different indexes related to drought resistance. The reasons for the change were also clarified. Good families with stable inheritance of drought resistance were screened to guide the selection of the provenance of red sand. The experimental results are as follows: apparent quantum efficiency (QE), dark respiration rate (RDX), light compensation point (LCPP), light saturation point (LSPN), maximum net photosynthetic rate (net photosynthetic rate). The maximum photochemical efficiency of PS 鈪，

本文編號：1604964