Internal factors of frost and drought resistance in plants

Drought Resistance in Range and Pasture Grasses

“…Several workers (11,18,21,31,38,39,44) have investigated the changes taking place in plants during the hardening process. MAxIMov (24,25), in 1929, made a comprehensive review of the basis of frost and drought resistance up to that date. SCARTH, LEVITT, and SIMINOVITCH (21, 38, 39) have done considerable detailed research on the nature of cold and drought resistance in plants.…”

Effects of Drought, Temperature and Nitrogen on Turf Grasses

“…He also observed the higher sugar content of the hardy varieties as compared with that of the non-hardy, but assigned nio particular significance to it. On the other hand, CHANDLER (8), anid later AKERMAIAN (3), MEYER (17), and MAXNIMOV (15), stressed the idea that soluble carbohy-drates may increase frost resistanice of plants by decreasing the precipitation of proteins.…”

“…Amiiong recent investigators (15,18) it appears to be the colnselnsus of 1Published with the approval of the Director of the Ohio Agricultural Experimelit…”

Investigations of the Hardiness of Plants by Measurement of Electrical Conductivity

“…MAXIMOW (12) has reviewed the various physical and chemical studies of the hardiness problem in which compositional or osmotic and colloidal properties of plants are shown to be associated with hardiness. He cites, as well, numerous recent investigations in which growth recovery from controlled freezing treatment is used to estimate the degree of hardiness.…”

“…MAXIMOW (12) in concluding his review of the various methods previously put forth states "we may observe that, notwithstanding a series of successful attainments, the .study of the internal factors conditioning hardiness has not yet established any reliable and easily determinable symptoms for use in breeding work. For this reason, refrigerating machines-are being more and more used for the acceleration of the breeding of frost resistant varieties."…”