scholarly journals Mating pattern and empty seed formation in relation to crown level of Larix decidua (Mill.) clones.

Silva Fennica ◽  
1991 ◽  
Vol 25 (4) ◽  
Author(s):  
Jaroslaw Burczyk ◽  
Grzegorz Kosiński ◽  
Andrzej Lewandowski
Keyword(s):  
Larix Decidua ◽  
Mating Pattern ◽  
Seed Formation ◽  
Empty Seed

scholarly journals Pollination success and full seed percentage in European larch (Larix decidua MILL.)

2019 ◽  
Vol 48 (No. 6) ◽  
pp. 271-280 ◽  
Author(s):  
B. Slobodník
Keyword(s):  
Correlation Analysis ◽  
Correlation Coefficients ◽  
Critical Value ◽  
Larix Decidua ◽  
European Larch ◽  
Seed Formation ◽  
Pollination Success ◽  
Empty Seed ◽  
Linear Correlation Analysis ◽  
The Mean

A relationship between the success of pollination and the percentage of full seeds of European larch (Larix decidua MILL.) was studied using several models of non-linear correlation analysis. Although the proportion of pollinated ovules was high in most cases (especially in the middle parts of open-pollinated conelets), the mean percentage of full seeds was extraordinarily low (after the controlled self-pollination even close to zero) and most of the calculated correlation coefficients are lower than the corresponding critical value. This fact gives an evidence for the strong effect of additional important factors causing the empty seed formation in Larix even after the successful pollination of ovules.

Aneuploidy and polyploidization in haploid tissue cultures of Larix decidua

1993 ◽  
Vol 88 (1) ◽  
pp. 73-77 ◽  
Author(s):  
Patrick von Aderkas ◽  
Parker Anderson
Keyword(s):  
Larix Decidua ◽  
Tissue Cultures

scholarly journals A unique mating pattern of Panorpodes kuandianensis (Mecoptera: Panorpodidae)

2017 ◽  
Vol 86 (3) ◽  
pp. 229-237 ◽  
Author(s):  
Xin Tong ◽  
Lu Jiang ◽  
Bao-Zhen Hua
Keyword(s):  
Mating Behavior ◽  
Sexual Conflict ◽  
Sperm Transfer ◽  
Nuptial Gift ◽  
Mating Pattern ◽  
End To End ◽  
Mating Behaviors ◽  
First Time

Sexually reproductive insects exhibit diverse mating behaviors. However, the mating pattern remains unknown for Panorpodes of Panorpodidae to date. In this study, we investigated the mating behavior and copulatory mechanism of the short-faced scorpionfly Panorpodes kuandianensis Zhong, Zhang and Hua, 2011 for the first time. The results show that the male provides a salivary mass as a nuptial gift to the female and starts to copulate with the female in a V-shaped position, then changes to an end-to-end position by temporarily twisting the female abdominal segments VII−IX by 180°. During mating the basal processes and the basal teeth of the gonostyli and the hypandrium are used to obtain copulation and sustain the coupling of genitalia to secure successful sperm transfer. This unique mating pattern is greatly different from that of other Mecoptera reported and is likely evolved as an adaptation in the context of sexual conflict.

scholarly journals 4-CPA (4-Chlorophenoxyacetic Acid) Induces the Formation and Development of Defective “Fenghou” (Vitis vinifera × V. labrusca) Grape Seeds

Biomolecules ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 515
Author(s):  
Zhenhua Liu ◽  
Yan Wang ◽  
Wenjiang Pu ◽  
Haifeng Zhu ◽  
Jinjun Liang ◽  
...  
Keyword(s):  
Vitis Vinifera ◽  
Outer Integument ◽  
Underlying Mechanism ◽  
Grape Seeds ◽  
Endosperm Tissue ◽  
Seed Shape ◽  
Seed Formation ◽  
Significant Difference ◽  
Fruit Setting ◽  
Chlorophenoxyacetic Acid

For some horticultural plants, auxins can not only induce normal fruit setting but also form fake seeds in the induced fruits. This phenomenon is relatively rare, and, so far, the underlying mechanism remains unclear. In this study, “Fenghou” (Vitis vinifera × V. labrusca) grapes were artificially emasculated before flowering and then sprayed with 4-CPA (4-chlorophenoxyacetic acid) to analyze its effect on seed formation. The results show that 4-CPA can induce normal fruit setting in “Fenghou” grapes. Although more seeds were detected in the fruits of the 4-CPA-treated grapevine, most seeds were immature. There was no significant difference in the seed shape; namely, both fruit seeds of the grapevines with and without 4-CPA treatment contained a hard seed coat. However, the immature seeds lacked embryo and endosperm tissue and could not germinate successfully; these were considered defective seeds. Tissue structure observation of defective seeds revealed that a lot of tissue redifferentiation occurred at the top of the ovule, which increased the number of cell layers of the outer integument; some even differentiated into new ovule primordia. The qRT-PCR results demonstrated that 4-CPA application regulated the expression of the genes VvARF2 and VvAP2, which are associated with integument development in “Fenghou” grape ovules. Together, this study evokes the regulatory role of 4-CPA in the division and continuous redifferentiation of integument cells, which eventually develop into defective seeds with thick seed coats in grapes.

Elusive Seed Formation via Electrical Confinement: Control of a Novel Cocrystal in Cooling Crystallization

2021 ◽  
Author(s):  
Aneesa J Al-Ani ◽  
Posy Sugden ◽  
Chick C Wilson ◽  
Bernardo Castro-Dominguez
Keyword(s):  
Seed Formation ◽  
Cooling Crystallization
Sign in / Sign up

Export Citation Format

Share Document