摘要:

Variable male sterility was encountered in a spontaneous mutant ofLycopersicon esculentumMill. ‘San Marzano.‘ The trait, conditioned by a single recessive genevms, was proved by trisomic and linkage tests to lie on chromosome 8, probably in the longer arm between the markersbuanddl.Under field conditions, from June to October in the interior valleys of California,vmsdevelops severely reduced, deformed stamens and defective corolla, being otherwise physiologically and morphologically normal. Despite the production of a limited amount of stainable pollen under these conditions, it is effectively male‐sterile. Earlier in the season in the field and throughout the entire year under normal greenhouse conditions, the flowers are normal except for a slight reduction in the width of corolla segments. Differences in temperature account for the varied response ofvmsto the environment, minimal temperatures of 30 C in the field and of 32 C in the greenhouse being required to evoke the sterile phenotype. Application of high temperatures to a single branch ofvmselicits a response only in the subsequently developed flowers of that branch. The approximate minimal requirements for the greenhouse environment are temperatures of 35 C or higher applied (1) for 4 hr/day for 2 weeks, (2) for 8 hr/day for 1 week, or (3) continuously for 48 hr. Thevmsresponse was also elicited by 29.5 C applied continuously for 96 hr and by 40.5 C for 12 hr. Depending upon the rate of growth, the response first appears 3–5 weeks after the start of treatment and continues for approximately the same length of time as that of the treatment. In the light of these findings and of the observed rate of development under the same environment, the sensitive stage is estimated to be flower primordia of 0.075 mm or smaller diam. Buds of this size appear very close to the shoot meristem, are still highly mitotic, and precede meiosis in PMC by at least 10 days—a relationship that is in keeping with the deformity observed in anthers of all dissectable sizes.

ISSN:0002-9122    

DOI:10.1002/j.1537-2197.1967.tb10683.x

出版商:Wiley    

年代:1967

数据来源: WILEY

摘要:

Genetic segregations for self‐incompatibility were obtained and analyzed inAnanas comosusandGasteriaspp. (G. verrucosaXG. picta). A single S locus with multiple alleles and gametophytic control of pollen phenotype was implicated in each genus. Inhibition of pollen‐tube growth in the upper third of the pineapple styles and in the ovaries ofGasteriawas confirmed. Allied studies of the genusHemerocallisrevealed stylar inhibition in some species and ovarian inhibition in others. The ovarian site of incompatibility reaction is discussed, and its association with hollow‐styled or styleless species and binucleate pollen is emphasized.

ISSN:0002-9122    

DOI:10.1002/j.1537-2197.1967.tb10684.x

出版商:Wiley    

年代:1967

数据来源: WILEY

摘要:

The isolation and successful two‐membered culture of the homothallic myxomycetePerichaena vermicularis(order Trichiales) is reported for the first time. Comparisons of mitosis in amoebae, zygotes and plasmodia as seen with phase contrast microscopy are made and distinguishing features of the different kinds of nuclear behavior are discussed.

ISSN:0002-9122    

DOI:10.1002/j.1537-2197.1967.tb10685.x

出版商:Wiley    

年代:1967

数据来源: WILEY