Experiments on the Respiration of X‐irradiated Barley Seeds

Experiments on the Effects of Neutron‐irradiation on the Respiration of Barley Seeds I. Effects on Growth and Oxygen‐uptake in Barley Seedlings of Different Varieties

“…It was demonstrated that the relatiniisliip between respiralion and neulroti dose deviated very little t'nnn litiearity (Figure 7). lit Ibe X-ray experiments (Mikaeisen atul Halvorsen, 1953) the dose curves bad a pronounced and tyyncally sigtnoid shape. Such a different effect of the two types of radiatioit may be explaitied by their different physical properlies.…”

“…The rate of res|)iration of hoth untreated and irradiated seeds was measnred daily during the first week of germination. A modified Warlmrg con.stant-vohime respirometer was used -as in the X-ray experiment carried out by Mikaelsen and Halvorsen (1953). The apparatus and technique are described in greater detail elsewhere (Halvorsen, 1955).…”

“…Jotun and Varde. In tbe X-ray experiments (Mikaelsen and Halvorsen, 1953) the two-rowed variety, Maja, was The water-contetit of Ihe seeds was deterniitied daily during Ihe experimental period. Results from one of the experiments (no.…”

The Effect of Neutron Treatment of Seeds on Seedlings of Diploid and Tetraploid Red Clover (Trifolium pratense)

“…In the greenhouse sowings a significant increase in germination percentage after treatment was found in single cases, but no such effects were observed in the sowings at The State Seed Testing Station of the same material. Our general results agree with those obtained in other species, viz., alfalfa (1), barley (7,9), oats and wheat (4).…”

Effects of Neutrons and Chronic Gamma Radiation on Growth and Fertility in Oats and Barley

“…T is a well-established fact that ionizing radiation seriously interferes I with growth and fertility of living organisms. In higher plants a number of reports (BJBRNSETH, GOKSC~YR and MIKAELSEN, 1957, CALDECOTT, FROLIK and MORRIS 1952, EHRENBERG and NYBOM 1954, EHRENBERG and SLELAND 1954, GRANHALL, EHRENBERG and BORENIUS 1953, MAC KEY 1952, 1954, MIKAELSEN 1956 among others) have demonstrated pronounced retardation of seedling growth and reduced seedsetting after exposures of ionizing radiations. Various kinds of ionizing radiations may not affect growth and fertility in the same manner.…”