Plant Responses to Environmental Stress:
from phytohormones to genome reorganization (1999)
edited by H. R. Lerner

Table 3 Types of Response of Plants to Environmental Stresses

Environmental condition Physiological condition of the plant and state of the genome
1 Before stress The plant is in physiological mode I.
2 Stressing conditions Environmental stress causes a transitional change in the physiological mode of the plant. the change can be biochemical, physiological, or in genomic expression (transcriptional or posttranscriptional), or in genomic organization, or a combination of these changes. One of the first changes, in plants, is a modification of the phytohormonal balance and a change in the plant's response to the phytohormonal balance.
3 Stressing conditions continued If the plant is capable of accomodation to the stress, it is now in physiological mode II, a new physiological mode that is more compatible with the new environmental conditions (stress). The new physiological mode can result either from a switch to a different, preexisting developmental program, or from the elaboration of new physiological programs that result from a modulation of the expression of the genome, that may occur through a DNA reorganization.
   If the plant is not capable of accomodation to the stress, it suffers, its growth and development are impaired, and it may die.
4 Environment returns to prestress conditions If the biochemical change and the change in genomic expression are reversible the plant returns to the physiological mode I. If these changes are irreversible the plant remains in physiological mode II. If an irreversible change in the genomic organization, which is transmitted to successive generations, has occurred the change is heritable. Reversibility or irreversibility depends on the plant genotype, on its developmental phase, and on the type of stress and conditions of exposures to it.
   The response to a stress is either preprogrammed or not. If not preprogrammed, accomodation occurs through different pathways resulting in an increase in variability.

CybeRose note: This table unifies much of what I have listed as Physiological Predetermination, Domestication of Wild Plants and Inheritance of Acquired Characters. And where the stress (or conflict) occurs in hybrids or grafts of differently adapted parents, it could also include Elective Expression, Stock/Scion Influence, Delayed Fertility and some "Exceptional" Crosses.