Evidence on the origin of the G genome in wheat: cytology and fertility of a T. timopheevi-like mutant

1983 ◽  
Vol 25 (6) ◽  
pp. 651-661 ◽  
Author(s):  
U. Kushnir ◽  
G. M. Halloran

A spontaneous somatic mutant with Triticum timopheevi Zhuk. plant morphology was found in late tillers of a Triticum turgidum L. var. dicoccoides (Bowden) plant. Hybrids of the timopheevi-like mutant with T. turgidum L. var. dicocooides (Bowden), T. timopheevi Zhuk., and T. araraticum Jakubz. exhibited irregular pairing at meiosis and sterility, almost normal pairing and fertility, and relatively high pairing and sterility, respectively. This evidence plus that of karyotype changes in the somatic mutant indicated that it was differentiated from T. turgidum dicoccoides through chromosome interchanges. This mutation, believed to arise through chromosome rearrangement, is discussed in relation to the origin of the G genome of T. timopheevi.

1970 ◽  
Vol 12 (2) ◽  
pp. 347-355 ◽  
Author(s):  
E. B. Wagenaar

Cytogenetic analysis of three backcross generations of the hybrid Triticum turgidum × T. timopheevi (2n = 28) showed segregation of meiotic behaviour in each successive generation. The segregation was continuous and was possibly under control of polygenes. These results indicate that the meiotic irregularities commonly found in F1 hybrids between T. turgidum and T. timopheevi are primarly genetically induced.


2016 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Suraida Suraida

Abstrak Penelitian ini dilakukan karena proses pembelajaran di laboratorium Biologi IAIN STS Jambi yang masih minim sarana prasarana yang ada di laboratorium, sehingga menghambat proses pembelajaran khususnya untuk mata kuliah Morfologi Tumbuhan. Penelitian ini bertujuan mengembangkan buku ajar praktikum dan mengetahui praktikalitasnya. Jenis Penelitian ini adalah penelitian pengembangan (Research and Development) dengan menggunakan 4-D Models yang terdiri dari 4 tahap yaitu Define, Design, Develop dan Disseminate. Karena adanya keterbatasan waktu dan biaya maka tahap disseminate tidak dilakukan. Produk yang dikembangkan berupa buku ajar praktikum yang divalidasi oleh validator. Produk yang telah divalidasi dan dinyatakan valid oleh validator, kemudian diujicobakan pada proses pembelajaran yang bertujuan untuk melihat nilai praktis buku ajar praktikum di laboratorium Biologi. Analisis data yang digunakan adalah data deskriptif untuk memvalidasi perangkat pembelajaran oleh pakar pendidikan. Selain itu juga diteliti data praktikalitas penggunaan perangkat pembelajaran ini yang diperoleh dari observasi dosen dan respon siswa. Nilai validitas produk 83,31% yang dikategorikan valid. Sementara nilai kepraktisan berdasarkan data observasi keterlaksanaan SAP, angket respon dosen dan siswa dikategorikan sangat baik atau sangat praktis. Penelitian menyimpulkan bahwa perangkat pembelajaran di Laboratorium Biologi yang dikembangkan adalah valid dan sangat praktis digunakan baik dosen maupun siswa. Kata Kunci : Pengembangan, buku ajar praktikum, laboratorium biologi Abstract [The development of a course book for plant morphology at biology laboratory] This research was triggered by the limited facilities of the biology laboratory at the State Institute of Islamic Studies Sulthan Thaha Saifuddin Jambi which became a constrain in the teaching and learning process of Plant Morphology classroom sessions. The objective of this research was to develop a course book as well as to reveal its practicality. The researcher did a research and development using 4-D Models consisting of four stages namely; define, design, develop, and disseminate. Considering the limitation of time and finance, the disseminate stage was not executed. The test revealed the validity score of the product was 83,31% which categorized as good. For its practicality, the product was considered as very good based on observation of lesson plan execution and lecturers’ and students’ response. In summary, the course book developed for the course at Biology Laboratory was categorized as valid and practical to be used by both students and lecturers. Keywords: development, a course book, biology laboratory


Weed Science ◽  
1974 ◽  
Vol 22 (5) ◽  
pp. 476-480 ◽  
Author(s):  
Robert W. Neidermyer ◽  
John D. Nalewaja

The response of wheat (Triticum aestivum L.) and wild oat (Avena fatua L.) to barban (4-chloro-2-butynyl-m-chlorocarbanilate) was studied as influenced by plant morphology and air temperature after application. Growth of wheat and wild oat seedlings was reduced by barban at 0.3 μg and 0.6 μg applied to the first node, respectively. Barban application to the base and midpoint of the first leaf blade required a lower dose to reduce wild oat growth than wheat growth. Increased tillering occurred from barban injury to the main culm in wheat. Wheat and wild oat susceptibility to barban increased as the post-treatment temperature decreased from 32 to 10 C. Barban selectivity for wild oats in wheat was greater at 27 and 21 C than at 16 and 10 C.


Author(s):  
Belgin Göçmen Taşkın ◽  
Özlem Özbek ◽  
Sibel Keskin Şan ◽  
Miloudi Mikael Nachit ◽  
Zeki Kaya

Agronomy ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 633
Author(s):  
Alberto Marco Del Pino ◽  
Beatrice Falcinelli ◽  
Roberto D’Amato ◽  
Daniela Businelli ◽  
Paolo Benincasa ◽  
...  

In this work, the biological activity of emmer (Triticum turgidum L. spp. dicoccum (Schrank ex Shubler) Thell.) wheatgrass extracts obtained from grains sprouted with distilled water, or salinity (50 mM) or selenium (45 mg L−1 of Na2SeO3), was tested through an experimental biological model based on the germination and cytosolic Ca2+ homeostasis of maize pollen grains. The effects of thapsigargin (TG) and of four phenolic acids (PAs: ferulic, coumaric, salicylic and 3-HO benzoic) on maize pollen were also tested as controls. Wheatgrass extracts influenced both pollen cytosolic Ca2+ and germination. The Ca2+ agonist activity of emmer wheatgrass was transient, different from that of TG, which caused a depletion of the stored Ca2+ and a permanent alteration of Ca2+ homeostasis. The results obtained with extracts compared to those obtained with pure PAs suggest that PAs in unconjugated forms, which are known to be well represent in emmer wheatgrass, contribute to the biological activity of extracts. The extent of the biological response of emmer wheatgrass extracts was influenced by emmer sprouting conditions (i.e., distilled water, or salinity or selenium). Maize pollen treated with Se-enriched wheatgrass extracts showed a less perturbed cytosolic Ca2+ and a higher germination rate.


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