The effect of gamma irradiation on biosynthesis of gibberellins in germinating wheat

Machaiah, J. P.; Vakil, U. K.; Sreenivasan, A.

doi:10.1016/0098-8472(76)90004-6

Cited by 14 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Irradiation has caused a depression of a-amylase synthesis in Triticum monococcum ssp. monococcum L. and Triticum aestivum L. (Machaiah & Vakil, 1979;Matsumura, 1960) as well as a reduction in the rate of gibberellin (GA) biosynthesis and overall (Machaiah, Vakil, & Sreenivasan, 1976). Gamma irradiation dosages that result in changes in germination and growth have specific decreasing effects on certain respiratory enzymes such as catalase, peroxidase, isocitric dehydrogenase, a-amylase, ribonuclease and 3 0 -nucleotidase.…”

Section: Discussionmentioning

confidence: 99%

Efficiency of energy conversion and growth of gamma irradiated embryos and young seedlings of Triticum monococcum L. cultivar Einkorn

Well¹,

Fossey

Booyse³

2018

Journal of Radiation Research and Applied Sciences

View full text Add to dashboard Cite

The study was conducted to determine whether the efficiency of energy conversion into growth can be used as an indicator for the determination of the optimal gamma irradiation dosage for mutation breeding. To meet this objective, embryo growth, shoot growth, root growth, mobilization of food reserves, respiration and energy conversion were studied in gamma-irradiated wheat Triticum monococcum L. cultivar Einkorn kernels. Kernels were exposed to 50, 150, 250 and 350 Gy and germinated. Kernels were collected 12 h after onset of imbibition and then every 12 h until 168 h. Irradiated seed demonstrated retardation in all parameters, which increased as the gamma irradiation dosage increased. For the most, dosage and time, as well as dosage by time interaction were highly significant. Root growth appeared to be the most sensitive to gamma irradiation, followed by shoot growth, mobilization of food reserves and efficiency of energy conversion. Full recovery of the efficiency of energy conversion took place at 50 Gy, with an increase in inefficiency with an increase in dosage. The point where full recovery of efficiency of energy conversion into growth gives way to incomplete recovery (100 Gy) is in line with the suggested dosages for practical mutation breeding in Triticum monococcum L. by the FAO/IAEA and is therefore an ideal indicator for predicting the dosage that will be optimal for plant mutation breeding.

show abstract

Section: Discussionmentioning

confidence: 99%

Efficiency of energy conversion and growth of gamma irradiated embryos and young seedlings of Triticum monococcum L. cultivar Einkorn

Well¹,

Fossey

Booyse³

2018

Journal of Radiation Research and Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Levitt (1980) attributed the decrease in soluble sugar levels to inhibition of photosynthesis. c-irradiation inhibited CO 2 assimilation (Stoeva 2002) and decrease the hydrolytic enzymes a-amylase and invertase, the enzymes involved in carbohydrate metabolism (Machaiah et al 1976). The decrease in soluble sugar levels, along with a-amylase and invertase activities may imply depletion of GA 3 by c-irradiation, which represses the activity of certain hydrolases (Gaber et al 2000).…”

Section: Resultsmentioning

confidence: 98%

“…A similar correlation was reported by Mansour (1994). Machaiah et al (1976) reported that c-irradiation blocks the production of phytohormones that are essential for nucleic acid synthesis.…”

Section: Resultsmentioning

confidence: 99%

Physiological effects of glycinebetaine on gamma-irradiated stressed fenugreek plants

Moussa

Jaleel

2010

Acta Physiol Plant

View full text Add to dashboard Cite

Irradiation stress adversely affects plant growth and development. The radio protective activity by glycinebetaine in plants has not been reported, and its mechanism has not been known. Gamma rays at doses 0.0, 25, 50, 100, and 150 Gray (Gy) when applied pre-sowingly to dry seeds of fenugreek from a cobalt source ( 60 Co) with strength of 500 Ci and the dose rate of 0.54 Gy/min significantly reduced chlorophyll content, total protein, photosynthetic efficiency ( 14 CO 2 -fixation), total dry weight, the accumulation of reducing, non-reducing and total soluble sugars in comparison with un-irradiated control. It also significantly repressed the activities of hydrolytic enzymes (a-amylase and invertase), the carboxylating enzyme (ribulose-1,5-bisphosphate-carboxylase/oxygenase) in the developed fenugreek plants. Soaking irradiated seeds with glycinebetaine (50 mM) for 24 h partially alleviated the depression effects of irradiation in these parameters. c-irradiation treatment increased significantly H 2 O 2 content. Presoaking irradiated seeds with GB decreased significantly the H 2 O 2 level. The magnitude of the reversal decreased with increasing the irradiation dose. c-irradiation induced a significant decrease in the level of nucleic acids (DNA and RNA) accompanied by a corresponding induction of hydrolytic activities of DNase and RNase in the developed plants in comparison with un-irradiated control. Those changes were more significant at higher c-ray doses. Posttreatment of irradiated seeds with GB partially alleviated the adverse effects of radiation. It significantly increased nucleic acid levels and repressed the activities of DNase and RNase. The protective role played by glycinebetaine was more significant at lower c-ray doses. Pretreatment of seeds with GB may play an effective role in the radiorepair mechanism.

show abstract

Significant Increase in Pyrimidinic Alkaloid (Trigonelline) Caused by Ionizing Radiation

Riedel¹

1987

Plant Vacuoles

View full text Add to dashboard Cite

The effect of gamma irradiation on biosynthesis of gibberellins in germinating wheat

Cited by 14 publications

References 30 publications

Efficiency of energy conversion and growth of gamma irradiated embryos and young seedlings of Triticum monococcum L. cultivar Einkorn

Efficiency of energy conversion and growth of gamma irradiated embryos and young seedlings of Triticum monococcum L. cultivar Einkorn

Physiological effects of glycinebetaine on gamma-irradiated stressed fenugreek plants

Significant Increase in Pyrimidinic Alkaloid (Trigonelline) Caused by Ionizing Radiation

Contact Info

Product

Resources

About