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Effects of temperature and plant growth regulators during the seedling stage on growth of Eustoma grandiflorum (Ref.) Shinn.
|關鍵字:||Eustoma;洋桔梗;Ethrel;ABA;plant growth retardants;cool night;益收生長素;離層酸;矮化劑;夜間涼溫;高溫||出版社:||園藝學系||摘要:||
本試驗使用洋桔梗 ''Royal White''(極早生種), ''Azuma no Nami''(早生
種), ''King of Blue''、''King of Pink Picotee''(中早生種),''Romio''
(Abscisic acid (±)cis - trans isomer)、矮化劑、夜間涼溫處理
Ethrel會抑制''Royal White''、''King of Blue'' 和 ''紫苑''品種初期的生
加著花節位,且濃度愈高愈晚開花。''Royal White'' 品種以 Ethrel
200ppm 處理株高最高; ''King of Blue'' 品種則以Ethrel 400ppm株高最
高。施用ABA 300 和600ppm對抑制初期生長的作用不明顯,也不會降低抽
苔率。苗期施用矮化劑可抑制初期的抽苔,且以Sumi-7 20ppm 和 PP333
200ppm效果較持久。施用Sumi-7 20ppm會降低''Royal White''品種抽苔率;
而 B-9 5000ppm、Sumi-7 20ppm、A-Rest 50ppm和 PP333 200ppm 都會降
低''紫苑''品種之抽苔率。''Royal White''品種施用Sumi-7 20ppm 和PP333
50ppm會延後開花。而施用B-9 5000ppm;Sumi-7 5、20ppm;PP333 50、200
ppm 和 A-Rest 10ppm皆會延遲''紫苑''品種開花。''Royal White''品種施用
Sumi-7 5和20ppm反而可增加株高;而B-9 2000ppm和Sumi-7 5ppm也增加''
紫苑''品種之株高。Sumi-7 5,20ppm和 PP333 50,200ppm會提高''紫苑''品
位愈高; 但節間縮短。夜間涼溫處理4週可使''Azuma no Nami''品種二個月
The growth activities of ''Royal White'',''King of Blue''and ''Si
En'' in the early stage were inhibited by spraying Ethrel.This
inhibitory effect increased when higher concentrations were
applied. There was no difference in the bolting percentage of
the cultivars except ''Si En'' by using Ethrel at more than
200ppm.It increased the node to the first flower but delayed
flower.As the concentrations of Ethrel increased, the days to
flower increased.The highest stem length of ''Royal White'' was
at Ethrel 200 and 400ppm for ''King of Blue''.ABA 300 and 600ppm
treatments did not reduce the early activity and bolting
percentage.The effects of Sumi-7 20ppm and PP333 200ppm were
constant. Sumi-7 20ppm application to ''Royal White''and B-9
5000ppm Sumi-7 20ppm, A-Rest 50ppm and PP333 200ppm to ''Si En''
decreased the bolting percentage. Treated ''Royal White''with
Sumi-7 20ppm, PP333 50ppm, and ''Si En'' with B-9 5000ppm, Sumi-7
5 20ppm A-Rest 10 ppm and PP333 50, 200ppm delayed the
flowering. The longer the cool night temperature treated during
the seedling stage, the later the flowered. It also had the
higher number of the first node to flower but shortened the
internode.The highest stem lengths of the 2-month-old seedlings
of ''Azuma no Nami'' were treated with 4 weeks cool night
temperature,and the 3-month-old seedlings were 2 to 4 weeks.
The highest stem length of the 2-month-old seedlings of ''Romio''
were treated with 6 weeks cool nigh temperature and the 3-month-
old seedlings were 2 to 4 weeks. It could break rosette
completely by cool temperature from November to March if the
plants sown in the late October and treated with 1-7 weeks high
temperature(33/28C). It bolted and flowered uniformly although
later than the control. It also had higher number of node to
bolting and branches. There was no significant difference in
height, nodes to the first flower and the fresh weight.
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