The effects of grafting on the morphology, physiology, and aerenchyma balsam pear aboveground under waterlogging stress were studied using a two-factor randomized block design. At 8 16 days, degree reduction grafted was lower than those self-rooted pear, although height leaf number pears remarkably reduced stress. Compared with considerably decreased malondialdehyde content leaves but substanti...

Root cortical aerenchyma (RCA) reduces root respiration in maize by converting living cortical tissue to air volume. We hypothesized that RCA increases drought tolerance by reducing root metabolic costs, permitting greater root growth and water acquisition from drying soil. To test this hypothesis, recombinant inbred lines with high and low RCA were observed under water stress in the field and ...

0305-7364/0 * For corre { Present Durham, NC Paspalum dilatatum occupies di€erent topographic positions in the Flooding Pampa, Argentina. Populations from di€erent positions are subjected to various regimes of ̄ooding and drought, both of which may occur in the same growing season. We investigated the constitutive and plastic anatomical traits of P. dilatatum populations from habitats with contr...

Root cortical aerenchyma (RCA) is induced by hypoxia, drought, and several nutrient deficiencies. Previous research showed that RCA formation reduces the respiration and nutrient content of root tissue. We used SimRoot, a functional-structural model, to provide quantitative support for the hypothesis that RCA formation is a useful adaptation to suboptimal availability of phosphorus, nitrogen, a...

Several root anatomical phenes affect water acquisition from drying soil, and may therefore have utility in breeding more drought-tolerant crops. Anatomical phenes that reduce the metabolic cost of the root cortex ('cortical burden') improve soil exploration and therefore water acquisition from drying soil. The best evidence for this is for root cortical aerenchyma; cortical cell file number an...

Ethylene production by primary roots of 72-h-old intact seedlings of Zea mays L. cv. LG 11 was studied under ambient and sub-ambient oxygen partial pressures (p 0 2) using a gas flow-through system linked to a photoacoustic laser detector. Despite precautions to minimize physical perturbation to seedlings while setting-up, ethylene produc­ tion in air was faster during the first 6h than later, ...