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Synopsis Extent of root growth of cereal plants was highly correlated with the soil moisture level. With oats, wheat, or barley, little penetration of soils at or below the permanent wilting point occurred, but penetration by side‐oats grama and sand lovegrass under the same conditions was fairly extensive. Leaf growth continued after root extension ceased on the most drought‐susceptible oat and wheat varieties.

Synopsis The F1, F2, F3, and backcross hybrids of the greenbug‐resistant varieties Dickinson Selection 28A and C.I. 9058 crossed with the susceptible varieties Ponca, Concho, and Crockett, and with each other, revealed that resistance is conditioned by a single recessive gene pair, common to both resistant strains. The gene symbol gbgb was assigned.

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Internode patterns of both the semidwarf and tall parents, used in a cross to study the inheritance of plant stature, revealed that: I) Average internode lengths were progressively longer from the base of the culm to the spike, and 2) The peduncle contributed approximately one‐half the total height of the tall parent and about one‐third the total height of the semidwarf parent in field plantings. The analysis of means for the three components, head length, peduncle length, and culm length (less peduncle), showed that head length in the segregating tall progeny added negative genetic components to total plant height. Gene effects tended to cumulate additively for peduncle length and culm length (less peduncle). Partitioning of populations for the two major components of plant height and total plant height pointed to one major nondominant factor accounting for most of the genetic variation differentiating the semidwarf and normal‐statured wheat.