全 文 :园 艺 学 报 30卷
The Diferent Changes of Endogenous Polyamines in Tomato Plants th Difer-
ent Heat-tolerance under High Temperatures
Du Yongchen,Mao Shengli,Wang Xiaoxuan,Zhu Dewei, Li Shude, Dai Shanshu, and Gao Zhenhua
(Inst/aae of Vegetables and Flowers,Chinese Academy ofAgricultural Sciences,8eq/~g 100081,Chins)
Abstract: e changes of endogenous polyamine levels induced by high temperatures were investigated in
tomato plants with diferent heat—tolerance.Plants were treated at temperatures of 25/20oC (day and night),33/
25 oC and 38/28oC at seedling or blooming stage.The results showed that the levels of spe rmidine and spermine in
heat—tolerant varieties significantly increased with increase of growing tempe rature. and the maximum was observed
at 38/28oC.In contrast, in heat—sensitive varieties,the highest levels of spermine and spermidine occurred at 33/
25oC.Th e temperature treatment of 38/28oC remarkedly decreased spermine and spermidine contents both in leaves
and flowers compared wi山 33/25℃ in heat.sensitive varieties.1he putrscine content showed no regular changes bo th
in temperature treatments and varieties .Th e involvement of polyamines in tomato heat tolerance iS discussed.
Key words:Tomato; Heat.tolerance;Polyamines
冷藏和气调处理对青花菜 Glucoraphanin含量的影响
汪俏梅 胡家恕 (‘浙江大学园艺系,杭州310029; 浙江大学生物化学研究所,杭州310029)
Efects of Cold Storage and Controlled Atmospheres on the Content of Giucoraphanin in
Broccofi Horets
Wang Qiaomei and Hu Jiashuz (‘I~ tmert ofHorticulture,刀 Unive ity,Hangz3mu 310029,China;2Institute of
Biochemistry,Zhejiang Uai~ ity, H 310029,Chins)-
关键词:青花菜 ;Glucomphanin(4一甲基亚磺酰丁基芥子油苷);冷藏;气调
中图分类号:S 635 文献标识码 :A 文章编号 :0513.353X (2003)03.0286-01
Glucoraphanin(4一甲基亚磺酰丁基芥子油苷)在青花菜中含量丰富,其降解产物 Sulforaphane具很强的抗癌活性 。
本试验以 ‘Marathon’青花菜为试材,将新鲜花球切成小花球后用 100 mg/L的 NaCIO表面消毒 1 min,清水洗净。分别
取 650 g花球置于0~C、5~C和 10℃冷藏 ,并在 5~C下进行 5种气调处理 :1)Air,2)Air+10% C02,3)Air+20% C02,
4)1% 02,5)1% 02+10% C02。每一处理分别在处理当天、处理后 3、6、9、12 d取样 50 g,真空冷冻干燥 ,并研
磨成粉末状贮藏于 4~C待用。将 0.2 g冷冻干燥样 品在沸水 中煮 10 min,3 500 g离心 5 min后,取上清液,再用 2 mIJ
重蒸水溶解沉淀后同法离心,合并上清液。提取液经 DEAE-Sephadex A-25柱层析后,加入 100 sL 0.1%的芳香基硫酸
酯酶 (aryl sulp}l北Ise)过夜,最后用 1 mL重蒸水过柱得到洗脱液供 HPIc分析。HPLC分析的色谱条件为 :150 mil×4.6
mm Soherisorb C-18柱 ,以乙腈和水作为流动相,1.5%~20%的乙腈线性洗脱 30 min,流速为 1.0 mL/min,采用 226舢
和 280 nln双波长检测 ,以烯丙基芥子油苷 (sinigrin)和硝基苯基半乳糖吡喃糖苷 (NPG)作为内标。
试验结果表明,在 0~C和 5~C冷藏期间,青花菜花球中的 Glucoraphanin含量无明显下降;而在 10℃下贮藏 9 d,其
含量开始明显下降,且此时的花蕾黄化 ,外观品质差。因此 IO~C条件下贮藏时间不宜超过 9 d。在 5~C的气调贮藏中,
较高的 C02(艋 +10% C02,艋 +20% C02)对 Glucoraphanin含量无显著影响,而较低的 02(1% 02,1% 02+10%
c02)则使其含量在0—9 d持续下降。从贮藏的效果来看,处理3可引起细胞汁液的渗出和酸味的产生,使产品的外
观品质明显下降,而处理2、4、5均有较好的效果,货架寿命在30 d以上。但较低的 使 Glucoraphanin含量明显降
低。从产品的外观品质和 Glucomphanin含量综合考虑 ,处理 2较好。有报道表明,低 02条件下,青花菜产品更易腐烂
和发酵,而低 02逆境可能引起 Glucoraphanin的代谢或降解,从而引起其含量的变化,具体机理尚待进一步研究。
收稿日期:2O02—10—21;修回日期 :2003—02—24
基金项目:教育部和浙江省留学回国基金资助项目
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