The great diversity in kinds of seed dormancy: a revision of the Nikolaeva–Baskin classification system for primary seed dormancy

This review provides a revised and expanded word-formula system of whole-seed primary dormancy classification that integrates the scheme of Nikolaeva with that of Baskin and Baskin. Notable changes include the following. (1) The number of named tiers (layers) in the classification hierarchy is increased from three to seven. (2) Formulae are provided for the known kinds of dormancy. (3) Seven subclasses of class morphological dormancy are designated: ‘dust seeds’ of mycoheterotrophs, holoparasites and autotrophs; diaspores of palms; and seeds with cryptogeal germination are new to the system. (4) Level non-deep physiological dormancy (PD) has been divided into two sublevels, each containing three types, and Type 6 is new to the system. (5) Subclass epicotyl PD with two levels, each with three types, has been added to class PD. (6) Level deep (regular) PD is divided into two types. (7) The simple and complex levels of class morphophysiological dormancy (MPD) have been expanded to 12 subclasses, 24 levels and 16 types. (8) Level non-deep simple epicotyl MPD with four types is added to the system. (9) Level deep simple regular epicotyl MPD is divided into four types. (10) Level deep simple double MPD is divided into two types. (11) Seeds with a water-impermeable seed coat in which the embryo-haustorium grows after germination (Canna) has been added to the class combinational dormancy. The hierarchical division of primary seed dormancy into many distinct categories highlights its great diversity and complexity at the whole-seed level, which can be expressed most accurately by dormancy formulae.

Comparative evaluation of varieties of winter hard wheat by the weight of 1000 grains with different morphotype of the germ

Abstracts. The productivity of plants depends on the weight of 1000 grains (M1000), the density of the productive stalk, the number of grains per ear, cultivation conditions, etc. The aim of the research was to comparatively evaluate M1000 in seeds differing in the morphology of the embryonic part, in varieties of durum winter wheat bred by the Agrarian Scientific Center “Donskoy”. The weight of 1000 grains were determined according to the State Standard 10842-89. The most productive and frequently encountered are the seeds with the main morphotypes 2, 3, 4, and 5, and the seeds with minor morphotypes 1a, 1, 6, and 7 make up 5%. An average positive relationship with M1000 of the entire heap of seeds was shown only for seeds of 2 main morphotypes - embryo morphotypes 2 (r = 0.45) and embryo morphotypes 5 (r = 0.42). Indicator M1000 embryo morphotypes 3 is not associated with M1000 of the whole seed heap, and all other embryo morphotypes for this trait have medium and strong negative correlation. Consequently, obtaining a fully formed grain in the dry spring and summer period is ensured by the stability of the filling of seeds of the main morphotypes 2 and 5.

Preliminary Investigation of Whole Versus Sliced (Cut) Potato (Solanum tuberosum L.) Tubers Performance in Pankshin, North Central, Nigeria

Potato is a highly perishable crop and storage facilities for the crop are also limited. Consequently, to keep planting materials (seed) from the end of one cropping season to the beginning of another pose a great challenge to growers. This study was conducted during the 2019 cropping season in Pankshin, Plateau state, Northern Guinea savanna zone, Nigeria to compare the performance of whole seed tubers (T1) and slice seed tubers (T2) of potato. The treatments were laid out in a randomized complete block design (RCBD), each replicated thrice. Individual plots have a dimension of 3 m x 5 m with distance of 1 m between blocks and 0.5m between plots. Parameters evaluated were rate of plant germination from cultivated tubers, plant height and fresh yield. The data were analysed using T – test. Results showed that there was no significant difference between whole seed potato and sliced tuber seed for all the parameters tested. This study suggests that in areas where seed tubers are scarce, growers should cut there potato seed tubers to enable them have more seeds for planting. Storage facilities should be provided to farmers by government and spirited individuals or groups in order to reduce the high costs of seeds for planting.

The composition of Australian Plantago seeds highlights their potential as nutritionally-rich functional food ingredients

When wetted, Plantago seeds become covered with a polysaccharide-rich gel called mucilage that has value as a food additive and bulking dietary fibre. Industrially, the dry husk layer that becomes mucilage, called psyllium, is milled off Plantago ovata seeds, the only commercial-relevant Plantago species, while the residual inner seed tissues are either used for low value animal feed or discarded. We suggest that this practice is potentially wasting a highly nutritious resource and here describe the use of histological, physicochemical, and chromatographic analyses to compare whole seed composition/characteristics of P. ovata with 11 relatives already adapted to harsh Australian conditions that may represent novel commercial crop options. We show that substantial interspecific differences in mucilage yield and macromolecular properties are mainly a consequence of differences in heteroxylan and pectin composition and probably represent wide differences in hydrocolloid functionality that can be exploited in industry. We also show that non-mucilage producing inner seed tissues contain a substantial mannan-rich endosperm, high in fermentable sugars, protein, and fats. Whole seed Plantago flour, particularly from some species obtained from harsh Australian environments, may provide improved economic and health benefits compared to purified P. ovata psyllium husk, by retaining the functionality of the seed mucilage and providing additional essential nutrients.

KARAKTERISTIK FISIKOKIMIA DAN SENSORI BERAS ANALOG MULTIGRAIN BERPROTEIN TINGGI

Several grains (green bean, red bean, soybean, corn, nuts, sesame, and millets) were processed to yield a high protein analogue rice. Red beans and green beans were soaked in water for six hours while soybean was boiled for 10 minutes and then peeled. Nuts were dried at 70°C, ground, and sieved to pass 80 mesh. All grains were ground into powder except for sesame which was in whole seed. Four formulas of rice analogues were produced at a different level of millet (0-15%), corn (35-50%) with fixed level of red beans (10%), soybeans (25%), green beans (10%), sesame (3%), and glycerol monostearate (GMS) (2%). The products were analyzed in terms of proximate composition, hardness, water absorption index, development ratio, cooking time, in vitro protein digestibility, amino acids composition, and protein digestibility-corrected amino acid score (PDCAAS). The four analogue rice formulas contained high level of protein and protein digestibility, but they did not fulfill the targeted complementation. The protein content of the analogue rice varied from 18.19 to 19.09% (wet based) with protein digestibility of 81.27-88.86%. The most preferred formulas of the rice analogue was composed of corn (40%), millet (10%, red beans (10%), soybeans (25%), green beans (10%), sesame (3%), and GMS (2%). It contained 42.48% of amino acids score and 36.53% of PDCAAS value.

Systematic Determination of The Ultrastructure of Local Faba Bean (Vicia faba L.) Seeds Using Light and Scanning Electron Microscopes

The present study was conducted to determine the seed morphologies and macromorphological characteristics of fifteen local faba bean (Vicia faba L.) genotypes collected from different region of Northern Cyprus. The characteristics in the seeds were evaluated using a light microscope (LM) and scanning electron microscope (SEM). SEM pictures were taken of the whole seed and its details. The scope of the research was examined comparatively using LM and SEM, and the seed shapes, surface ornamentation, and quantitative measurements were determined. Different characteristics for seed size and surface were found among the local faba beans accessions. Seed dimensions were between 12.44 and 24.26 mm long and between 9.49 and 17.45 mm wide, colors ranged from yellowish-brown to dark brown, and ornamentation of the seed coat varied. The local faba bean seeds were of subprolate and prolate types. We believe that using this technique to determine the differences among the seeds of different genotypes may play a role in helping to create different programs that can choose specific genotypes to improve cultivars based on the seed characteristics.

The influence of disinfection methods and liquid phase media on Paphiopedilum insigne seeds germination and media supplements on morphological features of protocorms in tissue culture

Paphiopedilum is a very original orchid, which labellum resembles a slipper. It is cultivated as a cut flower or a pot plant. The aim of the presented work was to estimate the influence of a disinfection method and addition of a liquid media on germination of Paphiopedilum insigne seeds in vitro. The whole seed capsules were disinfected with the use of 0.5% of AgNO3 for 20 min, 0.1% of HgCl2 for 5 s, 1% NaOCl for 30 min or immersed in a 96% ethanol and burned in a direct flame. The disinfected seeds were placed on a 1/4 MS (Murashige and Skoog) solidified media on top of which a liquid phase containing 1/4 MS elements, GA3 in concentration of 400 mg·dm–3 or distilled sterile water were added. The media without the liquid phase was also tested. It was noted that all methods of disinfection used effectively reduced contaminations of Paphiopedilum insigne seeds. The highest germination rate was observed when capsules were direct flamed and the liquid phase was added on top of the solidified media. The influence of growth regulators (BA, TDZ, KIN and 2,4-D) and casein hydrolysate added to the media on the morphological features of the obtained plants was also tested. It was observed that the most regenerated protocorms of the best quality were obtained when the media was supplemented with 1 mg·dm–3 of BA + 2 mg·dm–3 of TDZ or 5 mg·dm–3 of KIN + 1 mg·dm–3 of BA.