Phenology, floral morphology and seed yield in Indigofera tinctoria L. and I. suffruticosa Mill.

Abstract

Phenology, floral and pollen morphological features and seed yield were studied in Indigofera tinctoria L. and I. suffruticosa Mill. Indigofera tinctoria bloomed three times i.e., mid-July, mid-August and early October during the study period. But I. suffruticosa bloomed only once i.e., in early September. The number of flowers/raceme and pods/raceme were higher in I. suffruticosa than those in I. tinctoria. However, the number of seeds/pod, seed size, 1000-seed weight and seed yield were higher in I. tinctoria. Pollen with auriculae near the aperture in Indigofera is being reported here for the first time. Size and exine thickness of pollen grains were higher in I. tinctoria than in I. suffruticosa. The highest number of flowers/raceme and seeds/plant were produced at the second flush in I. tinctoria. Therefore, I. tinctoria plants may be harvested after the maturity of pods from second flush for higher seed yield. DOI: http://dx.doi.org/10.3329/bjb.v42i2.18024 Bangladesh J. Bot. 42(2): 231-237, 2013 (December

Floral morphology and seed yield in two Indigofera spp. as affected by shoot clipping

“…Shoot clipping had more adverse effect in I. tinctoria especially on seed yield compared to in I. suffruticosa (Table 5). The variations between the species in response to clipping might came from the difference in growth rate between the species (Jahan et al, 2013). The pods raceme -1 was significantly smaller in I. tinctoria than in I. suffruticosa both in clipping and control conditions, although shoot clipping increases fruit setting percentage in both the species (Tables 3 and 5).…”

“…The pods raceme -1 was significantly smaller in I. tinctoria than in I. suffruticosa both in clipping and control conditions, although shoot clipping increases fruit setting percentage in both the species (Tables 3 and 5). At 120 DAS when clipping treatment was done, I. tinctoria already exhibited 1 st flowering while I. suffruticosa showed no flowering (Jahan et al, 2013). Therefore, clipping in this experiment produced fewer flowers and pods and finally lowered the seed yield in I. tinctoria.…”

“…In cowpea, partial source removal induces increase in pod and seed yield (Hossain et al, 2006a,b) through the production of higher flowers plant −1 with reduced rate of floral abscission (Hossain et al, 2006b). In the present study, shoot clipping was done during and/or around first flowering (Jahan et al, 2013). Therefore, the flowering was delayed and seed formation was also delayed leading to a reduced seed yield in clipped plants in two Indigofera spp.…”

“…Previously, we reported the variation in phenology, floral and pollen morphology, and seed yield between two Indigofera spp. (Jahan et al, 2013). Clipping a portion of the shoot is one of the most important means for getting additional vegetative biomass yield and means of increasing plant growth (Costa et al, 1992;Rokonuzzaman, 2003;Howlader, 2013).…”

EVALUASI PENGARUH FAKTOR IKLIM PADA PEMBENTUKAN RANGKUM BUNGA DAN POLONG Indigofera zollingeriana

“…Peningkatan kebutuhan benih Indigofera ini memerlukan efisiensi dalam produksi benih Indigofera untuk dapat memperoleh produksi benih yang optimal. Produksi biji Indigofera dapat dipengaruhi oleh waktu panen, jumlah bunga dan jumlah polong (Jahan et al, 2013). Sedangkan lama periode pembungaan dan keragaman karakteristik dalam kualitas benih banyak dipengaruhi oleh curah hujan dan suhu (Łabuda dan Brodaczewska, 2007;Herrera et al, 2008).…”