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Bamboo: Flowering, Seed Germination and Storage

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Bamboo: Flowering, Seed Germination and Storage 4 Bamboo: Flowering, Seed Germination and Storage Manisha Thapliyal, Geeta Joshi and Falguni Behera 1. Introduction Bamboos are distinct and fascinating plants (tree-grasses) with a wide range of values and uses. They are indicators of high biodiversity, play a significant role in soil conservation and extensively used for soil and water management. They are important for biomass production and play an increasing role in local and world economies. About 2.5 B people in the world depend economically on bamboos (INBAR, 1999) and international trade in bamboos amounts to about US$2.5 M (INBAR, 2005). It has been traditionally used as fuel, food, rural housing, shelter, fencing and various other purposes. It is being used as industrial raw material for pulp and paper, construction and engineering materials, panel products, etc. However, the valuable bamboo resources are dwindling in their natural habitat due to gregarious flowering, forest fire and over exploitation for various end uses, which may have resulted in loss of their genetic resources without sufficient documentation (Bystriakova et al., 2003). To have sustainable availability, large scale cultivation of bamboos is required. For cultivation, information regarding its flowering, seeding, seed viability and propagation is primary. Bamboo grows for many years vegetatively by putting up of a fresh set of new shoots every year. At the end of the flowering cycle all the bamboos flower simultaneously. The vulnerability of some species is increased by the simultaneous flowering and, subsequent death of entire populations in cycles of 20-120 years. Thus, from economic point of view, bamboo flowering and fruiting is a calamity. 2. Bamboo Flowering Bamboos flower only once and die afterwards (Dhar, 2003), the reasons for it are still not clearly understood. The flowering of a bamboo is usually quite an extraordinary event - for the simple reason that it very rarely happens. In a 90 Manisha Thapliyal, Geeta Joshi and Falguni Behera population, flowering initially may be sporadic but gradually becomes gregarious. The flowering continues in a specific direction like a wave with a period of 12-14 years or more, spreading over the whole forest area as reported in Melocanna baccifera by Banik (2000). A bamboo can have one of the three flowering patterns dependent of genera and species. There are some bamboo species that have continuous flowering annually or nearly so, as happens in most herbaceous bamboos and in some cases in woody bamboos like Schizostachyum. Such species keep flowering year after year without any effect on the plant itself, although the seeds produced are rarely viable (www.guaduabamboo.com). There are some bamboo species which flower at the same time over an entire continent, some even say all over the globe. This is called gregarious flowering, i.e., simultaneous flowering of all the bamboos of a single clone spread over a large geographical area. Gregarious flowering generally progresses in waves for a period of two to three years from one end of a forest to the other. This is a strategy of nature to prevent the entire bamboo forest area from dying after the bamboos have flowered. Many of the big timber bamboos flower in this way. Each species has an inbuilt genetic time clock keeping track of its life cycle which may vary from anywhere between 20 to 120 years. Once a particular species reaches its life expectancy, it will start flowering which is then followed by the development of seeds. Bamboo flowering in this way spends an enormous amount of energy producing the flowers and seeds which usually stresses the plant to such an extent that it will die. A particular species can flower and die all over the world at the same time which happens because all plants originating from a particular source are clones of the mother plant (since bamboos are usually multiplied via cuttings or clump divisions) though it also happens in naturally regenerated clumps through seed. Another type of flowering pattern that some bamboo species undergo is sporadic flowering. As the name suggests, there is very little pattern to this type of flowering and it seems that it is brought on by environmental factors (such as drought or cold) rather than genetics. Flowering is usually not wide-spread but can happen to either singular plants or all of the same species within a localized area. Sporadic flowering rarely results in the production of viable seeds but on the upside, the plants very rarely die after the event. Flowering cycle of some bamboo species have been reported as- Bambusa balcooa: 35-45 years, B. bambos: 45 years, B. tulda: 30-60 years, Dendrocalamus giganteus: 40 years, D. hamiltonii: 30-40 years, D. longispathus: 30-32 years, D. strictus: 25-45 years, M. baccifera: 40-45 years, Ochlandra ebracteata: 7 years, Phyllostachys bambusoides: 120 years, Sinarundinaria wightiana: 01 year and Thyrsostachys oliveri: 48-50 years. Flowering reports of 35 bamboo species in India, from early nineteenth century to recent ones, have been given in Table 2.1. Table 2.1. Flowering of some bamboo species in India Bamboo: Flowering,SeedGerminationandStorage 91 Contd. on next page... Contd. from previous page... 92 Manisha Thapliyal, GeetaJoshiandFalguniBehera Contd. on next page... Contd. from previous page... Bamboo: Flowering,SeedGerminationandStorage 93 Contd. on next page... Contd. from previous page... 94 Manisha Thapliyal, GeetaJoshiandFalguniBehera Contd. on next page... Bamboo: Flowering,SeedGerminationandStorage Contd. from previous page... 95 96 Manisha Thapliyal, Geeta Joshi and Falguni Behera 3. Seed Morphology Seeds of bamboos cannot be obtained every year and after seeding the bamboos die. Seeds can be used for seedling production only for short duration of maximum six months. There are bamboos which have not produced seeds yet. So, production of planting stock in bamboo is difficult due to absence of regular seeding and short viability of seeds. Bamboos produce one-seeded fruit with thin pericarp adnate to the seed coat, is known as caryopsis covered with a number of persistent glumes (Gamble, 1896; Gould, 1968). The seeds (caryopsis) of Bambusa are oblong, smooth, fusiform, grooved on one side, ending in a short beak, pale brown and always surrounded by persistent glumes and palea (Fig. 3.1a.). While, that of Dendrocalamus are brown, ovoid to sub-globose and fusiform with obtuse or aristate rostrum at the apex covered with white pubescence, pericarp crustaceous (Fig. 3.1b, c) (Seethalakshmi and Muktesh Kumar, 1998). Fig. 3.1 Seeds of a. B. nutans, b. D. asper and c. D. strictus. There are about 110 genera and more than 1,500 species of bamboos in the world. Luckily there are only three types of bamboo seeds, which are recognized by the external appearance (morphologically). The first type is known as caryopsis in which, the pericarp is membranous, thin, soft and adhered to the seed coat. It is thin like a membrane and stuck to the seed coat which is the next structure below. The fruit has an apparent ventral suture- a depression which is nearly as long as the whole fruit. The second type of seed is known as Glans, it has hard, smooth, crustaceous pericarp separated from seed coat and no ventral suture. The third type is known as Bacca in which the pericarp is fleshy and thick and separated from seed coat. Seeds of bacca type are large. Largest bamboo seed, seed of Muli bamboo (M. baccifera) is of this category. Seeds of B. polymorpha are very small and about 125,000 seeds weigh a kilogram, whereas some are so big that only 15-20 seeds weigh a kilogram. like those of M. baccifera. Table 3.1. provides the approximate number of seeds per kg for some bamboo species. Bamboo: Flowering, Seed Germination and Storage 97 Table 3.1. Seed count (no. kg-1) in some bamboo species Species Seed count no. seeds kg-1 (Approx.) Bambusa bambos 60,000 – 75,000 B. nutans 65,000 B. polymorpha 125,000 B. tulda 20,000 – 25,000 Dendr ocalamus asper 75,000 – 80,000 D. brandisii 20,000 D. giganteus 40,000 D. hamiltonii 26,000 D. strictus 35,000 – 50,000 Melocanna baccifera 10 – 20 Ochlandra travancorica 45 – 50 Thyrsostachys oliveri 15,000 – 18,000 4. Seed Germination In the year following the flowering of the bamboo or years in the case of gregarious flowering, blooms tend to be concentrated in the months between November and April. Seeds are generally available from March to April onwards. However, seeds in the period May to July tend to have better viability and reproductive ability. Germination, in majority of the bamboo species, is epigeal with some exceptions like Ochlandra with hypogeal germination (Seethalakshmi and Muktesh Kumar, 1998). High percentage of germination (80-100) is obtained, if seeds are sown soon after collection under shade. Germination period is four to twenty days in orthodox seeds, while for recalcitrant seeds of Melocanna and Ochlandra it may be less. Germination in fresh seeds of bamboo is high like 90-95 per cent in B. bambos, 75-80 per cent in D. asper, upto 75 per cent in D. strictus, 55- 90 per cent in Ochlandra spp. Use of growth regulators like IBA and GA3 had significant influence on germination and vigour of seeds of D. hamiltonii (Singh and Nayyar, 2000) while IAA, IBA and NAA on D. strictus (Gopi Chand and Sood, 2008). 5. Seed Storage Seed longevity in bamboos varies with species from one to eight months. Caryopsis and glans types can be stored by controlling moisture content and temperature, for about four to five using scientific methods of seed storage (White, 1947; Gupta and Sood, 1978; Somen and Seethalakshmi, 1987; Sur et al., 1989; Thapliyal et al., 1991) but for bacca type no storage methods were found successful.
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