Dry matter content of apical and basal portions of Russet Burbank potatoes
Studies were made over a 4-year period of some factors affecting the dry matter content of the apical and basal portions of growing Russet Burbank potatoes. The greatest difference between portions was obtained from tubers of the normally irrigated plots of 1969. The amounts in the two portions in 1970 were nearly equal throughout the growing season. The major differences between the 2 years was a slightly cooler June and warmer maximum temperatures in July of the 1970 growing season. Moisture stress, particularly, early in the stage of tuber development (1972 season) caused a switch in amount of dry matter in the apical and; basal portions. Stress later in the development stage (1969 season) did not cause a switch. Fertility level was not as influential as moisture stress in affecting the ratio of dry matter in the two ends, whether under stress or normal moisture conditions.
Anatomy and compositional variation within potatoes
Re-examination of the histological development of the potato tuber supports Artschwager’s view that tuber growth is predominantly due to enlargement of the perimedullary zone and is of procambial origin. Pith (medulla) and cortical regions are differentiated from the ground or fundamental meristem derived from the apical meristem of the stolon apex, even before tuberization has been initiated. The procambium gives rise to external phloem, primary xylem, internal phloem and associated parenchyma, and likewise to interfascicular parenchyma. Those parenchyma cells so formed inwardly to the xylem “ring” contribute to the growth of the perimedullary zone. The sequence of tissue origins is diagrammed and discussed from the viewpoint of modern concepts of histogenesis.ResumenLa reexaminación del desarrollo histológico del tubérculo de papa le da creencia al punto de vista de Artschwager que el crecimiento del tubérculo se debe sobretodo al engrandecimiento de la zona perimedular y es de origen procambial. La médula y las regiones corticales se desarrollan por la diferenciación del meristemo fundamental que se deriva del meristema apical del ápice del estolón, aún antes de que empiece la tuberización. El procambio de origen al floema external, xilema primario, floema internal y el parénquima asociado y también al parénquima inter-facicular. Las células parenquimáticas formadas hacia el interior en relación al “anillo” de xilema contribuyen al crecimiento de la zona perimedular. Se da un diagrama de la sucesión ed los orígenes de los tejidos y se discute la sucesión desde el punto de vista de los conceptos modernos de histogénesis.
Using Infrared Thermography to Detect Moisture in Historic Masonry: A Case Study in Indiana
Nondestructive testing mapped water infiltration in the decoratively painted interior of a Masonic Temple in Muncie, Indiana.