The effect of dormancy on the heat shock response in gladiolus cormels.

نویسندگان

  • C Ginzburg
  • R Salomon
چکیده

Cormels of Gladiolus X gandavensis Van Houtte respond to heat shock by an induced synthesis of heat shock proteins. Synthesis of some of the non-heat shock proteins is concomitantly reduced. The ability of dormant cormels to synthesize heat shock proteins (hsps) and to repress the synthesis of non-hsps is greater than that of nondormant ones. A hsp of apparent molecular weight 68 kilodaltons is synthesized only in dormant cormels or in cormels that lost their dormancy after long storage at 25 degrees C. The synthesis of hsps at 40 degrees C, but not at 25 degrees C, is promoted by abscisic acid in nondormant cormels. Methionine incorporation into hsps declines after a 4-hour incubation period at 40 degrees C. Induction of hsps is stronger if exposure to extreme temperature is done gradually.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Effect of Benzyladenine and Gibberellic Acid on Dormancy Breaking, Growth and Yield of Gladiolus Corms over Different Storage Periods

A study was conducted to determine the optimum concentration of benzyladenie (BA) and gibberllic acid (GA3) to break the dormancy of gladiolus corms in relation to storage period and to find out the effect of BA and GA3 on growth and development of gladiolus corm and cormels. The effect of GA3 on dormancy breaking was most pronounced in the 100 ppm treatment being 26.93 days while in the water ...

متن کامل

The effect of dormancy on glucose uptake in gladiolus cormels.

The uptake of glucose and of 3-O-methyl-d-glucose by cormel slices of Gladiolus X gandavensis Van Houtte was studied in relation to cormel dormancy. Uptake was higher in nondormant cormels. Incubation of nondormant cormels with abscisic acid (ABA) reduced their uptake capacity. Treatment of dormant cormels with 6-benzyladenine (BA) did not affect their uptake rate. ABA and BA promoted O(2) upta...

متن کامل

Dark CO(2) Fixation in Gladiolus Cormels and Its Regulation during the Break of Dormancy.

The increase in dark CO(2) fixation during cold storage of Gladiolus x gandavensis van Houtte-type grandiflorus cormels is used to monitor changes in their state of dormancy. Dark fixation is also promoted by benzyladenine, which breaks cormel dormancy, and is inhibited by abscisic acid and gibberellin A(3), which inhibit cormel germination. The rate of dark fixation by nondormant cormels is fi...

متن کامل

Gladiolus hybridus ABSCISIC ACID INSENSITIVE 5 (GhABI5) is an important transcription factor in ABA signaling that can enhance Gladiolus corm dormancy and Arabidopsis seed dormancy

The phytohormone abscisic acid (ABA) regulates plant development and is crucial for abiotic stress response. In this study, cold storage contributes to reducing endogenous ABA content, resulting in dormancy breaking of Gladiolus. The ABA inhibitor fluridone also promotes germination, suggesting that ABA is an important hormone that regulates corm dormancy. Here, we report the identification and...

متن کامل

Effect of paclobutrazol and sucrose on in vitro cormel formation in gladiolus

Studies with excised shoots of six gladiolus cultivars viz., Bellariana, Blue Moon, Cream White, Friendship, Her Majesty and Top Brass indicated that paclobutrazol enhanced early cormel initiation and development. The interaction between paclobutrazol and sucrose was significant for cormel size. Supplementation of 10 mg L paclobutrazol and 120 g L sucrose to Murashige and Skoog’s medium favored...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Plant physiology

دوره 81 1  شماره 

صفحات  -

تاریخ انتشار 1986