Evidence for Natural Hybridity Between Guayule (Parthenium argentatum) and Mariola (Parthenium incanum)

Rollins, Reed C.

doi:10.2307/2437599

Cited by 24 publications

(23 citation statements)

References 2 publications

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“…16-22 characterize both species. Thus, in contrast with other instances of hybrids analyzed anatomically, such as Partbenium (Rollins, 1944) in which different trichomes characterize different species, distinctions between the two species of Salvia depend solely on distribution, not morphology. Non-glandular trichomes vary from short, with an appressed terminal cell ( fig.…”

Section: Epidermal Characteristicsmentioning

confidence: 79%

See 1 more Smart Citation

Leaf Anatomy as an Indicator of Salvia Apiana-mellifera Introgression

Webb¹,

Carlquist²

1964

aliso

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Section: Epidermal Characteristicsmentioning

confidence: 79%

“…A number of papers do emphasize the use of anatomical features, chiefly those of leaves and indument, in study of hybrids. These include Barua and Wight (1958), Cannon (1909), Cousins (1933), Heiser (1949), MacFarlane (1892), Pryor, Chattaway, and Kloot (1956), Rollins (1944), and Russell (1919).…”

Section: Introductionmentioning

confidence: 99%

Leaf Anatomy as an Indicator of Salvia Apiana-mellifera Introgression

Webb¹,

Carlquist²

1964

aliso

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“…Trichome morphology has been used as an important attribute in the classifi cation of genera and species (Heintzelman and Howard, 1948;Inamdar, 1970;Valencia and Delgado, 2003;Batterman and Lammers, 2004), and for the identifi cation of interspecifi c hybrids (Rollins, 1944). Hardin (1979) indicates that trichome morphology is commonly not affected by the environment, and therefore, may contribute to understanding the phylogenetic relations of different plant groups.…”

Section: Discussionmentioning

confidence: 99%

Trichomes with crystals in the Cephalocereus Pfeiff. areoles

2014

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This research describes the trichomes produced in the old vegetative areoles of the fi ve species of Cephalocereus Pfeiff. Light and scanning electron microscopy and energy dispersive X-ray analysis were used to characterize the crystals present in the stem vegetative areoles far from the apical meristem. We are reporting for the fi rst time for the Cactaceae family capitated trichomes with crystals. Crystals had diverse shapes (prismatic, styloid, sandy) and they all contain C as their principal element, as well as Na, Cl, Si, Mg, S, and Ca in different concentrations. Trichome and crystal characteristics allowed distinguishing the species of Cephalocereus. For example, capitate trichomes are shared by C. columna-trajani and C. senilis but differ because in C. columna-trajani there is one prismatic crystal per cell and sandy crystals in C. senilis. The other three species share non-capitated trichomes with prismatic crystals in the apical cell and styloids in the other cells. The species of Cephalocereus share the ontogenetic pathway of producing trichomes and spines in the areoles far from the apical meristem, suggesting that trichomes with crystals may be protecting the spines meristems. Key words: biominerals, Cephalocereus apicicephalium, Cephalocereus columna-trajani, Cephalocereus nizandensis, EDAX, scanning electron microscopy.Resumen: Esta investigación describe los tricomas de las areolas vegetativas de las cinco especies de Cephalocereus. La microscopía fotónica y electrónica de barrido, así como el análisis dispersivo de energía de rayos X, se utilizaron para caracterizar los cristales presentes en las areolas vegetativas de los tallos. Se reporta por primera vez para la familia Cactaceae tricomas capitados con cristales. Los cristales tuvieron diversas formas (prismas, estiloides, arena) y todos ellos contienen C como su elemento principal, así como Na, Cl, Si, Mg, S y Ca en diferentes concentraciones. Las características de los tricomas y de los cristales permitieron distinguir las especies de Cephalocereus. Por ejemplo, los tricomas capitados son compartidos por C. columna-trajani y C. senilis, pero se diferencian porque en C. columna-trajani hay un cristal prismático por célula y cristales de arena en C. senilis. Las otras tres especies comparten los tricomas no capitados con cristales prismáticos en la célula apical y estiloides en las otras células. Las especies de Cephalocereus comparten la vía ontogenética de producir tricomas y espinas en las areolas lejos del meristemo apical, lo que sugiere que los tricomas con cristales pueden estar protegiendo los meristemos.

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“…The better guayule type plants averaged 20% of q.borted pollen grains, whereas the intermediate type plants averaged 34%· The greater percentage of aborted pollen grains of these intermediate type plants might be attributed to the introgression of mariola, P. incanum, chromosomes or part of chromosomes. Rollins (6) has shown that mariola has played some part in the origin of these intermediate type plants. Here again hybt:idization played an important part in determining the percentage of aborted pollen grains by allowing the combining of certain gene complexes.…”

Section: Methods Of Reproduction Location Type Of Plant Variety Anmentioning

confidence: 99%

Frequency of Aborted Pollen Grains and Microcytes in Guayule, Parthenium Argentatum Gray¹

Powers¹,

Gardner²

1945

Agronomy Journal

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U SUALLY considerably less than so% of the commercial seed of guayule is viable. Hence, any information pertaining to the causes for this comparatively low· percentage of viable seed is of value in breeding this crop. For that reason, studies on the percentage of aborted pollen grains and frequency of microcytes (for definition of term see Belling and Blakeslee (r) 3 ) were made for collections of guayule, Parthenium argentatum Gray. Since the collections reproducing apomictically are pseudogamous (s), the information derived from such studies should facilitate the improvement of these forms also. MATERIAL AND METHODSThe collections employed in this study were grown from seed obtained from natural populations growing in Mexico and the Trans-Pecos Area of Texas. The Mexico collections were made by Powers and those from the Trans-Pecos Region by Powers and Federer. The commercial varieties were grown from seed taken from the same lots as those used in planting the commercial fields. The empty pollen grains and those showing definite disintegration of the cytoplasm were classed as aborted. Pollen grains having diameters less than 13.6 microns were classed as microcytes. In the case of aborted pollen the frequency recorded was the number in 100 f~ll-size pollen grains per plant and hence is the per.centage also; whereas, the m1crocytes recorded are the number among these same IOO full-size pollen grains and therefore are not a percentage.In staining the pollen for classification as to aborted pollen grains and microcytes, Watkin's cotton blue-lacto-phenol method as given by Lee (3) was used.The seed was planted in the greenhouse February I I, I943, "spotted out" March 8, and transplanted into the field at Salinas, Calif., on June 8 of the same year. After "spotting out" there were 72 plants per standard greenhouse flat. The design of the experiment was the same for greenhouse and field and was a 7 X 7 lattice squared with K + I replicates. Hence, there were 49 variates and 8 replicates. Four of the 49 variates were duplicates. The individual plot was 4 plants by 3 plants, making a total of 12 plants per plot. One hundred pollen grains were examined per plant and the pollen was collected on the basis of replications so as to control any differences due to time of collection. The plants in the field were spaced 4 feet apart in the rows and the rows were 4 feet apart.The analysis of variance was used in analyzing the data for testing significance of differences between means. Since the smallest average percentage of aborted pollen for any collection was not below IS and for most collections was I8 or above, and since the between-plot variances for the different collections were homogeneous, transformation of the data was not necessary. Because the majority of the values for microcytes were below ro, the transformation, VX + o.s, was used in analyzing the data for testing the significance of differences between means for number of microcytes among 100 pollen grains. X is the observed number. In calculating the variances ...

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Evidence for Natural Hybridity Between Guayule (Parthenium argentatum) and Mariola (Parthenium incanum)

Cited by 24 publications

References 2 publications

Leaf Anatomy as an Indicator of Salvia Apiana-mellifera Introgression

Leaf Anatomy as an Indicator of Salvia Apiana-mellifera Introgression

Trichomes with crystals in the Cephalocereus Pfeiff. areoles

Frequency of Aborted Pollen Grains and Microcytes in Guayule, Parthenium Argentatum Gray¹

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Evidence for Natural Hybridity Between Guayule (Parthenium argentatum) and Mariola (Parthenium incanum)

Cited by 24 publications

References 2 publications

Leaf Anatomy as an Indicator of Salvia Apiana-mellifera Introgression

Leaf Anatomy as an Indicator of Salvia Apiana-mellifera Introgression

Trichomes with crystals in the Cephalocereus Pfeiff. areoles

Frequency of Aborted Pollen Grains and Microcytes in Guayule, Parthenium Argentatum Gray1

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Frequency of Aborted Pollen Grains and Microcytes in Guayule, Parthenium Argentatum Gray¹