摘要
以花药帽易脱落的‘柠檬绿’和花药帽不易脱落的‘百万金币’文心兰切花为试材,探究花药帽脱落促使花朵衰老的原因。结果表明:去除花药帽的‘柠檬绿’和‘百万金币’分别在处理2和3 d较对照提前出现花瓣失水皱缩的衰老迹象,花药帽脱落16 h后释放内源乙烯,‘柠檬绿’内源乙烯释放速率为对照的55.42倍,‘百万金币’为8.57倍,去除花药帽后‘柠檬绿’和‘百万金币’花朵内源乙烯的释放速率分别在处理3和6 d达到峰值,释放量分别为351.59和82.57 nL·g^(-1)·h^(-1)。扫描电镜观察两个文心兰品种花药帽与蕊柱结合部位,发现‘柠檬绿’文心兰的蕊柱与花药帽的结合部位上不存在相匹配的长块状扁平结构,而‘百万金币’文心兰的蕊柱与花药帽的结合部位上具有相匹配的长块状扁平结构,两者之间的嵌合可能与防止花药帽的脱落有关。进一步研究发现,外源乙烯均加速了‘柠檬绿’和‘百万金币’花朵的衰老,分别在瓶插3和4 d出现衰老迹象,较对照提前2和3 d,含水量分别下降了12.57%和20.48%,丙二醛含量较对照组显著升高。未经外源乙烯处理的‘柠檬绿’单花瓶插1 d后花瓣含水量仅为‘百万金币’花瓣含水量的34.64%~43.39%,推测花瓣含水量减少或是文心兰衰老的主要因素之一。
Using Oncidium flexuosum‘Honey Angle’and‘Million Dollar’cut flowers as test material and the reasons for the senescence of O.flexuosum flowers caused by the anther cap shedding was investigated.The results revealed that the anther cap shedding of‘Honey Angle’and‘Million Dollar’resulting in petal dehydration and shrinkage earlier than the control for two days and three days,and began to release endogenous ethylene after 16 hours.The endogenous ethylene contents of‘Honey Angle’and‘Million Dollar’increased 55.42 times and 8.57 time respectively compared to the control.After the fall of the anther cap,‘Honey Angle’and‘Million Dollar’reached their peak of endogenous ethylene contents on the 3rd and 6th day,the ethylene contents were 351.59 and 82.57 n L·g^(-1)·h^(-1),respectively.Scanning electron microscope showed that there was no block flat structure on the junction between the anther cap and stamen of‘Honey Angel’,whilst on the‘Million Dollar’matching block flat structure was present which may reduce abscission of the anther cap.Moreover,exogenous ethylene treatment accelerates petal senescence of‘Honey Angle’and‘Million Dollar’.Petal dehydration and shrinkage appear on the 3rd and4th days after treatment in both varieties,respectively.Furthermore,the water content of both varieties significantly decreased by 12.57%and 20.48%,respectively,while the malonaldehyde contents significantly increased.The petal water content of‘Honey Angle’without exogenous ethylene treatment for one day is about 34.61%-43.39%of‘Million Dollar’.The results indicate that petal water content is one of the main factors of the senescence of O.flexuosum cut flower.
作者
李欣
刘亮
余让才
李昕悦
玉云祎
岳跃冲
范燕萍
LI Xin;LIU Liang;YU Rangcai;LI Xinyue;YU Yunyi;YUE Yuechong;FAN Yanping(College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,China;Flower Research Center,South China Agricultural University,Guangzhou 510642,China;College of Life Science,South China Agricultural University,Guangzhou 510642,China)
出处
《园艺学报》
CAS
CSCD
北大核心
2021年第6期1163-1172,共10页
Acta Horticulturae Sinica
基金
国家重点研发计划项目(2018YFD1000407)。
关键词
文心兰
切花
乙烯
花药帽
衰老
Oncidium flexuosum
cut flower
ethylene
anther cap
senescence
