楊子琴 陳星星 張蕾 洪繼旺 陳業(yè)淵 李松剛
摘 要 以?xún)?chǔ)良龍眼為試材,通過(guò)分析低溫誘導(dǎo)、氧化脅迫、自然低溫+藥劑處理龍眼成化過(guò)程中氧化損傷各指標(biāo)變化,研究龍眼成花和氧化脅迫之間的相關(guān)性。結(jié)果表明,氧化脅迫有利于龍眼成花。對(duì)頂芽和葉片活性氧、抗壞血酸和丙二醛(MDA)含量的檢測(cè)結(jié)果也表明,氧化脅迫誘導(dǎo)龍眼成花的同時(shí),也導(dǎo)致了龍眼樹(shù)各組織活性氧的累積,且抗壞血酸抑制龍眼成花,MDA促進(jìn)龍眼成花。因此認(rèn)為活性氧與龍眼成花呈正相關(guān)。
關(guān)鍵詞 龍眼;成花;氧化損傷;活性氧;丙二醛;抗壞血酸
中圖分類(lèi)號(hào) S667.2 文獻(xiàn)標(biāo)識(shí)碼 A
Relationship Between Longan Flower and Oxidative Damage
YANG Ziqin1, CHEN Xingxing2, ZHANG Lei1, HONG Jiwang1, CHEN Yeyuan1 *, LI Songgang1 *
1 Key Laboratory of Crop Gene Resources and Germplasm Enhancement in Southern China, Tropical Crops Genetic
Resources Institute, Chinese Academy of Tropical Agricultural Sciences, National Cultivar Improvement Center of
Tropical Fruit Tree, Danzhou,Hainan 571737, China
2 Henan Vocational College of Agriculture, Zhengzhou, Henan 451450, China
Abstract Low temperature induced, oxidative stress, natural low temperature combined with medicament spraying were used to study the correlation between longan-flowering and oxidative stress. Results indicated that oxidative stress induced longan flower, and led to the accumulation of reactive oxygen in parts of longan tree organizations, while ascorbic acid inhibited longan flower, MDA promoted longan flower. It confirmed there was a positive correlation between longan flower and active oxygen.
Key words Longan; Flower; Oxidative damage; Reactive oxygen species; MDA; Ascorbic acid
doi 10.3969/j.issn.1000-2561.2015.01.020
花芽分化標(biāo)志著植物從營(yíng)養(yǎng)生長(zhǎng)向生殖生長(zhǎng)的轉(zhuǎn)化。經(jīng)驗(yàn)發(fā)現(xiàn),在植物與環(huán)境的互作中適當(dāng)?shù)拿{迫往往促進(jìn)開(kāi)花,如適當(dāng)?shù)臄喔透珊得{迫有利于柑桔成花[1];低溫、氧化脅迫、甚至嫁接不親和都能誘導(dǎo)龍眼果樹(shù)的成花[2-4];干旱脅迫誘導(dǎo)枇杷[5]的成花;高溫脅迫可誘導(dǎo)水仙花FT-like NFT1基因高量表達(dá)[6];干旱脅迫造成了擬南芥中包括FLOWER LOCUS T(FT)基因在內(nèi)的4 153個(gè)成花相關(guān)基因差異表達(dá)[7]。脅迫條件的發(fā)生同時(shí)伴隨著活性氧的累積,低溫可使荔枝花芽的H2O2含量升高,相對(duì)電導(dǎo)率增大,對(duì)冷敏性強(qiáng)的荔枝會(huì)造成氧化脅迫與活性氧產(chǎn)生/清除的平衡失調(diào)[8],植物的防御系統(tǒng)在低溫逆境條件下會(huì)被破壞,導(dǎo)致活性氧大量積累,進(jìn)而造成生物膜的嚴(yán)重?fù)p害[9]。外施H2O2和NO促進(jìn)劑可以誘導(dǎo)蝴蝶蘭花器官中游離氧離子的濃度增加,進(jìn)而增加氧化損傷和脂質(zhì)過(guò)氧化及SOD、APX和非特異性過(guò)氧化物酶(POD)的活性,同時(shí)造成過(guò)氧化氫酶(CAT)和GR的活性降低[10]。……